Questions tagged [smtp]

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

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I am working with hydra, I am trying to get into an email I created. I am practicing brute force on myself

I am running the following command: hydra -s 465 -S -v -V -l <email address> -P /user/share/wordlists/rockyou.txt -e s -t 16 smtp.gmail smtp Every time I run this command, it says it found a ...
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Can I use Gmail Workspace with a mail domain not completly handled by Gmail?

I have a custom domain mydomain.com and here I have many mail addresses handled by my mail server. I would like to pass one of these address to Gmail workspace. Is it possibile to keep all other ...
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Ubuntu, IPv6, multihome, e-mail, source selection. Arghhh

I've been hosting my e-mail forever, and have been also using IPv6 via 6o4 (HE) for some time. Here (South America) IPv6 has been slow in acceptance, so to say, so everything went fine until now. Now ...
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Alternative way to Interact with Microsoft Office 365 server

My workplace has an Microsoft Office 365 and an "Outlook only" design philosophy wrt e-mail clients. As a long-standing user of emacs and mu I find the idea of using Outlook unbearable. I ...
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Google bounce email with error 550-5.7.1 Our system has detected that this message is likely unsolicited mail

I have a forward configuration in my Exim4 server, when it receives a message to a particular address, it is forwarded to a gmail account. Exim4 is configured with a valid DKIM and SPF authentication ...
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Why can't I send email from Thunderbird using an office365 account?

I have been struggling to set up Thunderbird to use an office365 account. Receiving was fine, as was managing my mailbox, but it simply refused to send, despite having all of the right settings: smtp....
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How to get Postfix and Dovecot working with an existing Kerberos realm?

I now have a Kerberos realm like MYDOMAIN.CH, an admin server and a principal of root/admin, as well as the realm master password and the root/admin principal password. Now I want to get Kerberos ...
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Postfix use distinct client certificate for upstream server

I have tried to read through the documentation of Postfix TLS support http://www.postfix.org/TLS_README.html here. There is a large amount of flexibility in the smtp_tls setup especially with ...
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Outgoing emails are not signing with DKIM

I have set up Postfix and OpenDKIM and I am trying to get outgoing emails signed by DKIM so that providers won't mark it as spam. However, even if I believe I set up the signing properly, none of the ...
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Outlook send only account

How can I set up a send-only account in Outlook 356 (on Windows)? I only have SMTP login information. There is simply no IMAP/POP3 server to log in to. I've tried this: https://nolongerset.com/send-...
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Two-piece mail server, working out sender_login and verified_recipient validation

TL:DR I'm trying to figure out how to get one postfix server to ask another whether a incoming email's recipient address is valid, or if an outgoing email's sender address is a valid email/alias for ...
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Possible to configure my VPS as a proxy of mail sent by another mail server?

I have a NAS which deployed with a full-featured mail server, but I cannot send mail to most of the other mailboxes because its IP is always blocked from sending mail, and the mail sent will be ...
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Possible to host a SMTP relay on Linux?

Let's make it brief. I have a NAS with mail server on it and a VPS, but I cannot send mail directly because the IP of the NAS is defaulty rejected by all, any mail sent will be returned. But the IP of ...
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send email issue on SQL-Server 2014 using msdb.dbo.sp_send_dbmail function

I am using Windows OS 2016 and MS SQL 2014 without any service pack. Since last couple of days i am not able send email from SQL DB using msdb.dbo.sp_send_dbmail utility. There is no change on ...
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How to set up local mail on AWS linux 2

ISTR that in the old days, on most unix boxes you could just mail someone ... and it pretty much just worked. I have a pretty decent understanding of how mail servers work, but ... it turns out I don'...
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SMTP server settings that can't be edited in Apple Mail

In my SMTP server list that appears in Accounts in Apple Mail I have several SMTP server records listed that do not appear in the Edit Servers window. I researched it and it appears that many Apple ...
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Outlook Exchange account view raw NDR report

Office 365 / Outlook I am interested in viewing the raw NDR report from a bounced message. The NDR from postmaster seems to be a special type of email, or Outlook is treating it differently. The NDR ...
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Unable to telnet to 127.0.0.1 (local Linux VM) to test SMTP port 25

I have the latest Kali Linux running on Hyper-V as a VM: Sendmail is installed (testing email server) Domain name purchased, say AlphaMoon.org with MX record pointing to my ISP IP address Netstat ...
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SMTP always fail on first attempt

I tried PowerShell to test SMTP, but the first attempt or first few attempts will always fail and receive the same error Send-MailMessage : Unable to read data from the transport connection: ...
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Outlook password encoding for email services (IMAP, SMTP)

I’m trying to make sense of how different mail clients log onto IMAP and SMTP services. There are the normal ones and then there is Outlook. Outlook seems to unconditionally encode passwords as Latin-...
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Can't send mails as root with Mutt through MSTP

I successfully set up Mutt and SMPT to send to myself some logs through emails. As user, it works perfectly However, when I ask through sudo crontab -e as root to send some logs after running some ...
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How to force trust SMTP Let's Enrypt cert on Linux?

There's an SMTP server running on ps.mydomain.com:587. When I try to establish SSL connection with it, it fails with certificate verification error. Here's an example openssl output (Debian 11.1, ...
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Postfix Setup of out bound email via my DNS provider

I'm what I consider a better that average Linux guy and I've get up everything on the main host and its working well for my wife and myself . The home office works very well, with few complaints, ...
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POP3 + Mail client = no new messages on server (despite having new messages on server)

I'm using Thunderbird. I've used it forever. Today I noticed mail wasn't being delivered for about 2 days; after checking the usual suspects and confirming I see new mail in my server account's /var/...
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Issue with Telnet/ UBUNTU / WSL2 SMTP connection (451, Request action aborted on MFE proxy, SMTP server is not available)

I recently installed wsl2 and Ubuntu on my windows 10 system and ever since, I've been having trouble programmatically sending emails out. Ping works just fine but whenever I try to use telnet on the ...
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Office365 SMTP server extremely slow from Thunderbird on Linux

I've been using Thunderbird on Linux to access the Office365 email account of my company. Starting from last week, connections suddenly became extremely slow. I regularly wait for 3 to 5 minutes ...
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Send a MIME Email with PUTTY

Im currently wondering how to send a mime mail with putty, important is, for now i only want to "declare" the mail as a mime mail if thats possible. I dont want to send an actual picture,...
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Can Delivery Status Notification (DSN) be deactivated on the client side?

Recently, I wrote some important email and wanted to be certain that they got delivered. After searching on the internet, I was reading about Delivery Status Notifications (DSN, not to be confused ...
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Postfix DKIM applied to messages sent locally but not remotely

I've got Postfix running normally on a server. I can send email from it LOCALLY, and I get the typical mailed-by:domain and signed-by:domain mail headers that Gmail uses to show a verified email. My ...
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X-Mailer/User-Agent Mail Header informationen on Non-Default OS (e.g. IXI-Connect OS)

I'm wondering, if mail header information added by the mail clients (e.g. User-Agent/X-Mailer) on non-default OS like IXI-Connect OS that has been used with the OGO handheld device (e.g. OGO-CT12) are ...
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How to interpret specific SMTP responses

I've been having a terrible problem sending emails from a godadddy shared-hosting (CPANEL) email account to any email account hosted by Network Solutions. I have spent hours on the phone with ...
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SMTP server to redirect to another SMTP server

I'm trying to make it so I can send emails using my student email address from my primary email account. My school has set up a SMTP server we can use. However, my primary email account is Protonmail ...
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Postfix & Mailtester Bad DNS & MX Records

I have another thread open here: Postfix not sending to gmail [added spf & dkim] I have following issue: mail-tester is telling me i have no mx and a record but this is not true. So i think i have ...
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Postfix not sending to gmail [added spf & dkim]

Hello i've been struggling for a while now. I will give all the details i can. OS: Ubuntu 20.04 Server: DigitalOcean (Droplet) Domain Registrar: Namecheap I hope i did not change up somethings with ...
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Postfix: inbound and outbound relay with store and forward - advice needed

My ISP blocks port 25, so I'd like to setup a store and forward inbound and outbound postfix server (relay-server) that communicates with a mailstore server (mailstore-server), which is unable to ...
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Smtp4dev does not catch the port communication

I am using Smtp4dev server for localhost to catch port communication. The server is running, and I can see the page on localhost:5000 where it confirms it's listening on port 587. I also have Laravel ...
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Telnet port 587

Our IIS hosted system sends Email through an account example@ieu-iq.org. Sometime ago, my ISP blocked port 25 so it stopped sending, talking to my email provider GoDaddy, they said I can use port 587. ...
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Run Mercury on Xampp portable

I do use xampp-portable-windows-x64-8.0.3-0-VS16. But Mercury was disabled and \xampp\MercuryMail\ folder was empty. So I copied files from install version and enabled Mercury in xampp-controll.ini. ...
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Configure postfix for external SMTP

I have a PC at home with Manjaro, connected to the internet through a MODEM that an "internet service provider" has installed for me, from which optical fiber goes out to the world. My ...
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Difference between SMTPd and SMTP

Hi can someone tell me what is the difference between the SMTPd and SMTP ?? i found that smtp is Postfix SMTP client and smtpd is Postfix SMTP server is this real ??? I found other information : ...
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Telnet to Gmail SMTP "starttls auth" syntax error

When I Telnet gmail and send an email using cmd promt, everything works fine. After Telnet smtp.gmail.com 587, following conversation with the server happens: 220 smtp.gmail.com ESMTP m184sm839913wme....
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How to filter email originating from @domain.com on Exim4?

I'm trying to implement a basic phishing protection on our Exim4 email relay. The way we have our mail delivery setup is following: external hosted smtp server -> exim4 relay -> Exchange server ...
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How set Default vs. specific outgoing server

I am using Thunderbird 78.9.1 and Win7. I have a few email accounts that are associated with my own web site. In TB: Tools | Account Settings | Outgoing Server (SMTP) I have 3 entries: ...
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How to analyze why an email was misdirected?

I received an email from someone I know and relating to a club we both belong to so I'm confident it is not harmful, but in my limited knowledge of email headers I can't tell why I received it as it ...
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What is the difference between Gmail SMTP port 465 and 587 in Mutt?

Which Gmail SMTP port should I use in Mutt's smtp_url configuration option? I noticed that port 465 only works with smpts://..., while port 587 only works with smtp://... (by "works", I mean ...
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My e-mail is being used to send spam, what can I do?

I am renting my own domain from a German hoster, and have created 4 e-mail accounts on it. All was well for 5+ years. For about a week now, one of those accounts receives around 5 e-mails per day from ...
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difference between nc and telnet using smtp service as an example

I can use both nc and telnet to connect to port 25. $ nc 192.168.1.120 25 220 localhost ESMTP Exim 4.68 Tue, 29 Dec 2020 06:07:27 +0000 $ telnet 192.168.1.120 25 Trying 192.168.1.120... Connected to ...
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How are the FTP, SMTP, SSH ports used?

I know these are three questions, but I put them together because I think one connects with the other. I understand that when you want to send an email it's done using the SMTP protocol. Now port 25 ...
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Gmail SMTP Errors and False Positives: "The email account that you tried to reach does not exist"

Since earlier today, I've been receiving notification from Gmail SMTP alerting to "hard bounces", but the gmail addresses are valid and messages are NOT being delivered. Here's an example of ...
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How to temporarily disable accounts in outlook (pop3 & smtp)

One can easily disable pop3 accounts in outlook (2019) by not including the account in a send/receive group. However, this still attempts to connect to the account's smtp server. When an email ...
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