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Questions tagged [smtp]

Simple Mail Transfer Protocol is the protocol used for sending email.

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18 views

How can I manually configure my IMAP and SMTP servers in Outlook 2016

Microsoft is trying make it easier for people to configure their email settings in Outlook 2016 but unfortunaletly, they are also making live extremely difficult for users who need a different ...
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0answers
20 views

Postfix configuration - canonical address mapping

I am trying to configure the mapping in postfix to take all outgoing mail and redirect it to certain inboxes. I have a working setup which will rewrite/redirect properly in the canonical_recipient ...
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1answer
20 views

I'm stuck with postfix on debian: 554 5.7.1 Relay access denied

I'm really stuck with a problem on my postfix installation for a few days ago. I know there is a lot of stuff about this on the net, but none of what I tried worked. Here is my problem: I can send ...
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0answers
25 views

How to get Email Server Smtp, Pop3 or Imap Settings? [on hold]

How to do I get the Settings of an Email Server before I Setup an Email Client.. I was interested in a Tool that would give me the Response of an Email Server, its SMTP POP3/IMAP Details, port numbers,...
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0answers
8 views

SMTP not working with multiple mail clients. Firewall turned off

With Opera Mail, I don't even see any connection attempts using Fiddler. With Windows Mail it seems to not do anything with Fiddler open but without Fiddler I get "We weren't able to send this message,...
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0answers
4 views

SMTPlb error: Connection reset by peer

I recently learned how to use the SMTPlb module and I used it to spam a friend, but after about 40 emails sent, it threw a "Connection reset by peer" error. Any ideas as to what's happening? Code is ...
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1answer
33 views

SMTP Clients rejected with Citadel

I setup a Citadel Mail Server on a RPI 3B+. I have DNS setup, port forwarding, and port open on firewall. When I enter through the webmail portal, I can send and receive mail just fine. The issue that ...
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0answers
12 views

SMTP to gmail loop back my domain postfix

I am trying to send gmail my local postfix. I want to sent from info@example.com to whitebear@gmail.com I am using bear user to sent email to SMTP. It looks like sent correctly. [bear@jp1 ~]$ ...
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1answer
59 views

Don't deliver mail to certain addresses

I have a Postfix 2.10.1 running on CentOS 7. This service will deliver email notifications that are sent to the postfix via SMTP. Now, some users should not get those notifications. Since the sending ...
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1answer
43 views

SSMTP can't establish a startssl connection from a Raspberry Pi

I'm trying to set up automated e-mails on my raspberry pi, but it won't negotiate a STARTTLS session. The ssmtp.conf is as follows - root=postmaster mailhub={mailserver}:587 AuthUser={username} ...
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2answers
60 views

Setting up a SMTP relay that goes back and forth

I have a Postfix SMTP server running at home which can't send or receive mails because of an ISP restriction. (no incoming port 25, nor outgoing) I have a VPS with a public IP that I want to use to ...
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20 views

Postfix relay, multi domain, securety and basically everything

I want to set up a relay server with a static ip on the web, which is supposed to accept mails for multiple domains and also send out mails for those domains. Unfortunatly my experience with postfix ...
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2answers
97 views

postfix/dovecot, other domain is using our server to send spam

Our server is being used to send spam from an account that doesn't belong to our domain. This account is sending emails to other domains and it is affecting our IP reputation. log: Nov 20 06:31:42 ...
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3answers
275 views

How to get the maximum attachment size of a mail server which perform ip connection whitelisting?

I need to ask a fiscal document through sending an e‑mail tosie.nantes-sud@dgfip.finances.gouv.fr. In order to get it received, I need to attach a lot of documents. So when I sent the e‑mail from ...
1
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1answer
29 views

Is there a way to get outbound email working from with Apache and PHP on a Drobo 5N without compiling source code?

I wanted to send emails from my web page running in Apache and PHP on my Drobo 5N. Found a lot of answers about cross-compiling MSTMP or SSTMP. For example the answers I found that specifically dealt ...
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0answers
29 views

Postfix difference myorigin mydomain

I understand the meaning of myhostname and mydomain in postfix config. First is used to identify server, second do identify domain and configure other params. So myorigin is: The domain name that ...
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0answers
70 views

How can I force fetchmail to re-fetch mail in Gmail's inbox?

My Linux server fetches mails from gmail and sends it to a Domino server process (SMTP). No problem there. The issue is that mails were fetched before the Domino server was started, so there was no ...
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1answer
70 views

selinux preventing PHP/Roundcube from connecting to local SMTP or IMAP ports

EDIT: I've determined the cause is selinux. After disabling enforcement with setenforce 0 everything worked. So the new question is, what's going on with selinux? I only have default CentOS 7 policies....
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1answer
48 views

View/change IMAP/SMTP options in Outlook 365

The interface of Outlook 365 has changed a few days ago with an update. I can't find anymore where can I view or change the IMAP/SMTP options for the email accounts I've added to the application. I'...
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0answers
29 views

Can't send mail with MH-E (nmh)

I can't seem to get MH-E configured correctly for sending mail. I have no problem in receiving and perusing mail. ~/.authinfo has correct credentials for SMTP server ~/.netrc has correct credentials ...
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2answers
31 views

SPF - that is just limiting what IPs are allowed to relay?

Am I missing something, or is SPF simply a way to say "only clients on the following networks are allowed to send email through this server"? Which - for a Comcast or someone who owns the IPs for all ...
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0answers
48 views

How can I determine who is blocking port 25 from the internet?

I'm flummoxed. I've bought a domain name through 'freehostia.com' - and I've setup the MX records to point to my DDNS based local SMTP/POP3 server which I'm running on a Synology NAS box. I've ...
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0answers
42 views

Apple Mail Can't Send Email with Gmail IMAP

I've got a client that I've set up G Suite for. They have multiple accounts (10) that they need to use regularly, so we set them up with Apple Mail to manage their emails. They seem to be able to ...
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0answers
43 views

Set up alias Gmail from a custom domain

I have a domain tsas.vn, I use Gmail for the mail service. I also have another free @Gmail account. Now I want to set up the free Gmail account to be an alias of the tsas.vn account. I somehow couldn'...
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0answers
21 views

Cannot send SMTP E-mail through terminal after installing SSL

I had setup the mail client to send E-mail via terminal on my ubuntu 14.4, which was working fine until I decided to enable ssl. Now whenever I try to send using the command echo "Test mail body" | ...
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0answers
137 views

Scan to Email via Gmail SMTP failing to connect

I Can't convince scan to email on the office scanner (TOSHIBA e-STUDIO3505AC ) to connect to gmail via smtp. Settings: Enable SMTP Client: Enable Enable SSL: Accept all certificates without CA SSL/...
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0answers
90 views

Telnet not working from a specific server to specific port

I am using 2 servers (A and B) centos 7. I am trying to telnet from A to mail.smtp2go.com serverA$ telnet mail.smtp2go.com 2525 Trying 45.33.53.153... telnet: connect to address 45.33.53.153: ...
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0answers
504 views

GSuite and DNS: “Reverse DNS does not match SMTP Banner issue” reported by mxtoolbox - what to do?

In https://mxtoolbox.com -> domain health test, we have this issue: PROBLEM DETAILS SMTP Banner Check What you see when your domain has this problem LISTED SMTP Banner Check ...
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0answers
19 views

SMTP-EXIM Help- Only sending single mail at a time

I would like to understand what could be the problem as to why I am unable to send mail to more that one recipient at a time. My mail server uses exim and I have the following configuration ...
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0answers
403 views

Windows Server 2016 - enable SMTP logs

Does anyone know how to enable and view the SMTP logs on Windows Server 2016? I could not find any information on Google. I am getting this message from a client Email: Login denied on host smtp://...
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1answer
243 views

Is it possible to have an IMAP account but use a different SMTP server?

My ISP has problems with their outgoing mail server, resulting in a significant portion of my outgoing emails being discarded on a more or less random basis. I'm using IMAP. I also have another ...
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2answers
293 views

Exim4 setup that allows me sending emails without becoming an open relay

So I've acquired a VPS and a domain (my_domain.com, say), and now I'd like to set up my own, exim4-based e-mail infrastructure for learning purposes. In order not to produce an open relay I need some ...
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1answer
131 views

How are these emails entering my mail queue, and why is Google reporting “Bad credentials”?

I am using a combination of Postfix, Dovecot and Roundcube for a web mail system. I have a Google Apps for Domains account so am using Google's SMTP server for outgoing mail. I noticed a couple of ...
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1answer
105 views

How to get e-mail delivered at specific time, to the second

What would be a good strategy for getting a mail delivered at a specific time e.g. 20:00:00, while also ensuring it does not get delivered even a second too early. I'm trying to apply somewhere. ...
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1answer
37 views

SMTP proxy to circumvent a blocked port 25

Like most residential ISPs, my ISP blocks port 25 to keep me from running a mail server. For reasons unimportant to this thread, I do not want to run the mail server on the VPS if I don't have to. ...
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1answer
882 views

Getting “Delivery has failed to these recipients or groups” on every received email

in Office 365 I recently converted an email address from a shared mailbox to a user mailbox, but I've noticed that every time we receive an email to that address (even though we DO actually receive it)...
2
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1answer
56 views

Thunderbird: How to edit server connection settings of already existing accounts?

How can I change the server connection settings for already existing accounts from previous STARTTLS to desired SSL/TLS? Of course, even for existing accounts in menue Account Settings -> Server ...
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0answers
96 views

Telnet timeout on reconnect after “quit”

I am currently investigating the timeout errors of sending email. Some email send immediately, some are timeout even if the same smtp outbound. And I found out, when I telnet <host> 25 It ...
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1answer
132 views

How to replay or manually send an email through my MTA

I have a dynamic email analysis engine (a glorified MTA) that detects malicious content. I recently had an email get through without being detected. We (meaning out vendor) made some adjustments to ...
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1answer
211 views

Unable to traceroute 'smtp.gmail.com'

I've been trying to configure my NAS to send SMTP messages, but the transmission always seems to fail. To diagnose this problem I tried traceroute'ing "smtp.gmail.com:587"... It always fails on the ...
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1answer
306 views

which port does postfix connect to remote smtp server?

I mean I can use port 465 to submit an email(destined to sombody@gmail.com) to my Postfix server in a secure way, but which port does Postfix use to connect to gmail's smtp server? If Postfix uses ...
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0answers
75 views

Selecting an fqdn scheme naming for internal hosts behind nat (in case of setting up mail)

There are several geographically remote branches in acme ltd. Specific servers should have ability to send mail to some google group (or other public - good secured server). There are no predefined ...
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0answers
150 views

How to setup SMTP relay on redhat

I like to setup SMTP relay on redhat7 using postfix with SSL over SMTP. The idea is that the email receive from postfix suppose to forward to another 3 different domain email address. email@postfix....
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0answers
149 views

Setting up SMTP mail for LOGO! CMR module

I'm trying to get my Logo!8 PLC to communicate with the use of a CMR2020 GPRS module. I have no experience working with SMTP-servers. The setup looks like this: I've tried using a normal Gmail ...
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0answers
45 views

Dispatching emails to Postfix server really slow

I've setup a small web application using network of virtual servers running on ESXi. All VMs host Fedora 27. I have 2 of these setups. One for testing and one for production. All internal hardware and ...
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0answers
43 views

Outlook sending “Not read” emails automatically in a batch

A workmate's computer suddenly sent a whole bunch of emails with "Not read" receipts this morning - without the user being present. The user is using Outlook 2013 and IMAP. The receipts were all ...
3
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1answer
5k views

Sending an email from Python using local Python SMTP server

I have a server running Raspbian Jessie from which I want to send emails using Python. I have seen two modules that might work including smtpd and smtplib. I've seen lots of examples, some including ...
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0answers
249 views

Is it possible to use AWS WorkMail with an external SMTP and IMAP?

I would like to use AWS WorkMail but I want to keep my old Mailadress at a "public provider". Right now I'm using Zarafa with fetchmail to get Emails and Smarthost to send Emails via the Server of the ...
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1answer
2k views

Configure sendmail as a client to SSL Port 465 (SMTPS)

Basically the same question as Sendmail Configuration SMTP Relay Port 465, however, the answer there is "I have abandoned the idea of using my host as a sendmail relay and moved over to using Gmail". ...
3
votes
1answer
1k views

After opening port with ufw, nmap output shows port as closed

I'm trying to receive SMTP messages on port 25 (this is where my MDA server lives). I've opened port 25 on my box sudo ufw allow 25 with this output: Rules updated Rules updated (v6) But when I ...