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

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MS Exchange — How to send authenticated email as same email for public folder

Is it possible to create an authenticated MSExchange user that can send email on behalf of any other user in the system (public folder emails as well) without configuring it on a user-alias basis? If ...
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6 views

Make mutt save outgoing mail to a specific directory when SMTP sending fails

I have mutt configured to sent mails via SMTP. Sometimes it fails sending, either because of a poor wifi connection, or when I mistype the To: address (seems to me). The failure in itself is not so ...
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10 views

Prevent Fake E-Mails with Postfix

I have a secure and almost-properly-configured SMTP/Dovecot server running, but I do have a problem. As it's currently set up, anyone (who has valid credentials) can send e-mail from any address in ...
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29 views

Relay access denied (in reply to RCPT TO command) Postfix Issue

I am trying to configure my server for email taking reference form this link: koray.me/smtp-relaying-outgoing-mail-in-postfix-using-webmin. I used Mandrill smtp server in my case. I have also ...
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11 views

How to relay to microsoft

i am trying to configure smtp for my clients using postfix in ubuntu on port 465 but i would like to do relay to microsoft with no encryption, please help i have tried following steps on one of the ...
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6 views

make postfix bypass amavis completely for specific domains

I want the postfix agent to bybass the amavis scanner for all mails from and to a specific domain. So, i added the following line to /etc/postfix/main.cf header_checks = ...
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1answer
126 views

Outlook 2013 cannot send email (“Message rejected under suspicion of SPAM”, error 554)

I have been using a POP3 account in Outlook 2013 to download and send email for some time without any problem. Recently I have setup a new POP3 account and am having difficulty sending email. The ...
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6 views

How to switch incoming & outgoing mail servers in Postbox Express after switching hosts?

I recently had all my websites switched over to another host. I have e-mails associated with each website, and I'm using Postbox Express. You'd think it would be easy, but for the life of me, I ...
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43 views

smtps service not found/“warning: connect to transport private/smtps: No such file or directory”

I'm trying to access an SMTP smarthost example.com using TLS via port 465 by adding smtps inet n - n - - smtpd -o smtpd_tls_wrappermode=yes -o ...
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6 views

Can I use an outgoing service on my SMTP server on a differnt port to 587/465?

Creating my own SMS service using PHP and came to an impasse: the firewall uses ports 587 and 465 for SECURE IMAP so it's a no go to use TLS or SSL on those ports. Is there a way I can use different ...
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1answer
51 views

How turn on SMTP Authentication?

How turn on SMTP Authentication? When I try send a mail from my mail server email (example@example.com) to my icloud email (@icloud.com) I receive this back: Mail from IP( my.ip.rigth.here) was ...
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33 views

Setting up php to send email through IIS

I have a wordpress site on my Windows 2012 R2 IIS server. I have installed SMTP. These are the setting I've done in php.ini: [mail function] ; For Win32 only. ; http://php.net/smtp SMTP = localhost ...
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30 views

Only one computer not connecting to SMTP

I have setup exim/courier mail server and flawlessly configured mail clients on all devices but one. OS X 10.10.3 mail.app can't connect to SMTP. SMTP does not have many configurations to setup ...
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1answer
16 views

debugging a curl request / what would be the curl request to test whether a given username / password is working against a speciific smtp server

I have a customer using a specific app that uses secure smtp to connect for outgoing email. I have a suspicion that it somehow got changed (whether by them or by the hosting provider is irrelevant). I ...
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1answer
21 views

AT&T's SMTP to SMS increments sender address

I have a service that delivers updates to users through various carriers SMTP APIs, for example for Sprint we e-mail 1234567890@messaging.sprintpcs.com and then the owner of the number 123456789 ...
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1answer
107 views

Unable to send email via any of SMTP servers using an IP camera, why?

I'm trying to setup Mail Settings on my IP Camera, but none of the SMTP servers seem to work, and this is only happening when it's connected on my DSL connection! Otherwise it works great on my cable ...
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2answers
57 views

Can an email delivery silently fail?

Can an email delivery silently fail ever, with the sender receiving no notification whatsoever about the failed delivery? Specifically, can silent delivery failures occur for mail sent to a Gmail ...
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1answer
22 views

Postfix / Dovecot Mail appears in logs, but not in its respective folder

I'm currently trying to set up Postfix with Dovecot, but something does not seem to work the way it should be. For some reason, mails I sent to my mail account appear in the logs, but do not become ...
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22 views

How to setup a SMTP hook

I have an edimax ic3140w camera on a domestic alarm system which provides out of the box event notification through: - Email (SMTP) - FTP upload - Push Notifications ideally I'd like to have the ...
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1answer
59 views

Use AWS EC2 to redirect incoming mail

Is it possible to setup an EC2 instance as a mail server and relay incoming mail to my domain to my in-house server on a different port than port 25? Right now I use rollernet.us for this. Which ...
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167 views

How do I find out if a printer is scan to email compatible with Office 365?

I have a Toshiba e Studio 282 that previously had scan to email going through an Exchange server. The Exchange server was decommissioned and the company got Office 365 instead. I tried inputting the ...
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1answer
288 views

postfix - warning: connect to transport private/smtp: Connection refused

I have been having trouble with my postfix+dovecot mailserver. Every time I try to send an email to a different server (gmail etc.) I get the following messages in the log: postfix/qmgr[28918]: ...
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1answer
68 views

What Exchange permissions are given to each receive connector? (Bypass SPAM, etc)

Exchange has a list of permissions that are assigned to each connector based on the checkbox selection below. Here are an example of some SMTP headers that are used internally (in routing) to ...
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27 views

Invalid hostname in HELO sent by MUA

I have a mail server running exim4 with an ACL that drops the smtp session if the hostname in HELO is an IP address. Exim is configured to do the reverse dns check. The said ACL is the very first one ...
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30 views

Conditional relay with credential based on domain recipient?

I use postfix to send email directly, but sometimes outlook.com won't deliver my business email messages. After changing the SPF record, the delivery succeeded, but goes to the recipient's Spam ...
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30 views

Postfix private relay

I've setup my postfix + dovecot server successfully and can send/receive mail however I would like to setup a cluster of 2-3 extra servers which are used for outgoing mail. I have looked into options ...
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31 views

purpose of MIME in mail message header

I received a mail which contains only english alphabets (hence all are ascii and shown below). When I checked the header of the mail (which is posted below), as far as I know, "MIME-version:1.0" is ...
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1answer
41 views

custom domain email forwarding catchall recovery [closed]

In short, I'm trying to restore mailflow for a free domain I setup with unonic. (3 technically) They worked fine for about a year. *@example.tld would all forward to my@personal.email. January 6th, ...
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25 views

How to investigate for mail not sent/received

I've got a classic ASP page that sends emails to registered users. From one month to date, some users which have their emails on 3 specific domains, are not receiving emails. Some others with their ...
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1answer
100 views

send mail through msmtp

I've been trying to send mail with msmtp with no success Configuration file: ~/.msmtprc defaults auth on tls on tls_trust_file /etc/ssl/certs/ca-bundle.crt logfile ...
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85 views

550-Please deliver mail to the address specified in the MX records for this 550 domain

I have a PHP script which emails the results of a form to a specified address. Previously it was working fine but now it's not sending email anymore. When I check the error log, I see this error: ...
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587 views

552 This message is not RFC 2822 compliant [smtp-07.iol.local; LIB_670]

I have had autoresponder emails set up for a while already, and suddenly I get the following message as undelivered. I only got this one time, so it seems not to be a general problem. I checked RFC ...
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2answers
36 views

What have I done wrong with my Postfix config?

My mailserver has been sending emails fine and dandily to newsletter subscribers via the Mandrill app, but I have not been receiving emails on the domains I want, I only want mails to go to the user ...
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1answer
295 views

Email not being sent from Moodle [closed]

I’m using Moodle where I allow user to register themselves, after which an email is sent to them. However, when user are registering, the email is not being sent and I’m getting the error: Tried ...
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293 views

Postfix - SMTP mail delivery failed with “Connection timed out” error

I have installed postfix mail server in ubuntu machine. I am facing some issues with the mail sending to other domain mail servers (Google, Yahoo, Outlook...). I am using virtual domain to send the ...
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259 views

How to configure to send emails from localhost pc with postfix xampp and xubuntu configuration

I am building some website and for testing purposes i need to configure somehow to be able to send emails from my pc. I have xubuntu installed on my home pc and xampp for local development. I have ...
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38 views

Is there a way to have multiple SMTP sending services configured in WHM?

I have WHM installed on my server and I have Mandrill setup to handle all mail requests. Right now all the mail runs through that SMTP server. Is there a way to take a domain on the server, ...
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177 views

macosx: How to unblock SMTP port?

In /var/log/mail.log I see runs of time-out errors in quick succession, like this Dec 13 15:50:31 myserver postfix/smtp[2911]: connect to alt2.gmail-smtp-in.l.google.com[74.125.138.26]:25: Operation ...
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92 views

How to set up a sendmail relay using HP-UX 11.x

I need to setup and HP-UX 11.23 system as a mail relay to collect mail from other internal HP-UX servers and relay them to the MS Excahnge operated smtp relay for delivering internet bound mail to the ...
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1answer
301 views

Connecting Brother MFC-L2740DW to SMTP via SSL

Its very frustrating to see that I bought this MFC-L2740DW just a few weeks ago and its 2014 released printer with AirPrint support. I'm not able to activate a feature called 'scan to email server', ...
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36 views

msmtp complains no auth method found

msmtp output: <-- 220 example.com ESMTP Postfix (Ubuntu) --> EHLO example.com <-- 250-schemacs.com <-- 250-PIPELINING <-- 250-SIZE 10240000 <-- 250-VRFY <-- 250-ETRN <-- ...
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67 views

Moved to Office 365, want to use SBS exchange as SMTP relay

I've recently setup an Exchange Online subscription with Office 365 - for all the benefits of cloud email in a small business. My onsite server is Windows SBS 2011. My problem is that my internal ...
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2answers
352 views

How to use unencrypted SMTP/POP3 to connect to Outlook.com, Gmail or other email services?

My new multifunction printer only works with unencrypted SMTP and POP3 (so 90's!), but most of the popular email services such as Outlook.com and Gmail only support encrypted SMTP and POP3. Is there a ...
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182 views

Mail Enable: mail server requires authentication when attempting to send to non-local users

I get this error: Bad sequence of commands. The server response was: This mail server requires authentication when attempting to send to a non-local e-mail address. Please check your mail client ...
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61 views

Multiple postfix instances one host

I have a server on which i need to add setup a second postfix configuration to send e-mail (doesn't have to receive) that's being sent in from a PHP web application that's hosted on the server aswell. ...
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1answer
204 views

SMTP fails using Thunderbird after dropping Comcast, installing CenturyLink

On two Windows 7 PC's, an Android tablet, and Android phone, a dozen email accounts have been working fine for many years. I disconnected Comcast and installed CenturyLink service using Actiontec ...
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276 views

Postfix SMTP message being marked as SPAM by Gmail and Yahoo

I'm having a problem getting my low-volume of legitimate email messages through the SPAM filters of Gmail and Yahoo. I have followed Gmail's guide here: https://support.google.com/mail/answer/81126 ...
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102 views

Able to receive, but not send email over SMTP from VPS. I don't think I'm being blacklisted

The error I get is "421 Downstream server error" or something similar. Up until a few days ago I could send mail without any trouble. I've searched around, and most other people with this problem end ...
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331 views

Why does postfix give “lost connection after EHLO” error when Gmail tries to connect to my SMTP server?

I'm trying to setup my gmail account so that I can send emails that appear to come from another email address I own (myuser@mydomain.com). Instructions to do so are here. When I try to do it, it ...
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1answer
76 views

How does email routing work?

I want to understand how email routing works. Lets say I am trying to send a message to someone @gmail.com. According to my current understanding, the following steps happen: DNS MX query on ...