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Questions tagged [relay]

23 questions
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postfix relay - send message to a non-existing mail address does not fail

I have a docker-mailserver with a relay on a tiers server (Oracle cloud email delivery). When I send a message to a non-existing address (e.g. to gmail), I get a Code 250 Ok Sent (should not it be a code 550 ?), but I would like to receive an email…
Fnifni
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2 answers

How to prevent unauthorized relay of mail in Postfix

It seems that our mail server is being used to send spam. The sender of the email is a spoofed real account on our server. There is no email in the sent history for that account. I would like to know if there is any way to prevent this. Any advice…
adm
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Is it possible to send mails via Postfix on another machine in the same LAN without having to relay it?

I thought this was a quite common situation, but I'm struggling a bit getting this to work in the easiest way possible, and also, I'm not sure if I'm doing it in a good/recommended way by now. I have two servers that can communicate via a LAN (and…
Tobias Leupold
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Fetchmail + Postfix - can't make them work together

Task is the following: There is a mail server in a secure zone with no access to Internet and/or other networks. I need to relay contents of one of the mailboxes to Amazon SES for delivery. I set up Fetchmail to grab mails from the said server. I…
Sart
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1 answer

mail relay routing FROM domain with dkim

Current setup First of all i must say that im so so (read like "nothing know") in things like postfix or open dkim. We have many domains on our exchange (realy a lot). and thats work like "enternet -> firewall -> mail gateway -> exchange's -> mail…
Dopler
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Postfix to O365 tenant directly

I am planning to have a postfix smtp relay that will send emails to an O365 tenant. Is this possible through port 25 without using SASL?
manwithamission
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1 answer

Separate eMail relay: DNS requirements beyond PTR record?

Some cloud business offers "always-free" VM instances. Not quite big, but enough for me, so I’m going to migrate my infrastructure there, including mail.example.com. That machine handles incoming mail for @example.com (example.com MX 10…
Al Klimov
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1 answer

SMTP send error Client does not have permission to submit mail to this server. The server response was: 4.7.1 : Relay access denied

This error comes on my server when I am sending mail outside my domain like to Google, Microsoft, etc. Below is my Postfix config file. # See /usr/share/postfix/main.cf.dist for a commented, more complete version #postmap /etc/postfix/sasl_passwd #…
Maanic Tech
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