Questions tagged [mail-transport-agent]
To be used with questions relating to a Message Transfer Agent also known as Mail Transfer Agent (MTA) or mail relay.
56
questions
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Can lines be wrapped in /etc/aliases?
I am using /etc/aliases to direct group emails to multiple accounts, for example:
postmaster: john
abuse: john
www: paul
team: john, paul, ringo, george
One of the lines is getting quite long due to ...
- 152
1
vote
1
answer
269
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How does cron know what MTA to use?
How does cron know what MTA to use? Where is this info stored please? (Using Ubuntu KK.)
Edit: Here's the whole story: I enabled the MAILTO option in crontab, and scheduled some task. When the task ...
- 11
0
votes
1
answer
92
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sendmail: does `TLS_Clt` support CIDR-formatted network blocks in /etc/mail/access?
Does sendmail support TLS_Clt access matching based on blocks of IPs? So far the official sendmail TLS documentation I have found does not indicate that it does (nor that it doesn't).
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1
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How can I make GNU mailutils to use an external SMTP server?
Does anybody on this planet know what the equivalent GNU mailutils command to the following looks like?
Is this even possible without a local MTA with mailutils?
Using s-nail it works as intended.
s-...
- 61
1
vote
1
answer
737
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During email delivery, how do MTA, MDA, POP/IMAP connect with each other?
I have already read Why use Dovecot AND Postfix/Sendmail?, Why use both Dovecot and Postfix?, Why use both Dovecot and Postfix? which give the general idea, but here I'm looking for more precise ...
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336
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Send cron mail using dockerised postfix
I recently moved postfix into a docker container, with ports 25 and 587 exposed on the host machine.
Since doing this, cron on the host machine is now unable to send emails due to No MTA installed, ...
- 430
1
vote
0
answers
137
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replace MTA with something not email related
What I try to achieve is to send all my server logs, errors, crontab outputs etc. with something like telegram or signal. I am locking for a MTA with can handle a different backend and is still ...
- 21
0
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1
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1k
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sendmail: Using alternative port with smart-host
Sendmail not following smart_host alternative port macro.
Using Exchange server, exchange.redacted.com, we are using port 2525 for internal devices and some Linux based machines, allowing them send ...
- 447
-2
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1
answer
115
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Why is the email sending process not symmetric with the receiving process?
Reading https://ccm.net/contents/116-how-email-works-mta-mda-mua and https://en.wikipedia.org/wiki/Email_agent_(infrastructure),
I wonder why the email sending process is not symmetric with the ...
- 103k
0
votes
1
answer
189
views
block IP or spam or another problem
I setup an SMTP server(Postfix), Then I send an email to my gmail, I get the following email from gmail:
This is the mail system at host mail.pahlevanzadeh.net.
I'm sorry to have to inform you that ...
- 11k
0
votes
1
answer
79
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courier-mta (esmtpd) only delivers messages to /var/lib/courier/tmp
I swear that courier-mta was working before, but now it has stopped working.
The problem first started out with getting "submit: Permission denied" errors and I was unable to send emails to the ...
6
votes
2
answers
5k
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What's the difference between an MTA and SMTP server?
Take postfix for example. It's an MTA, but is it also an SMTP server? Are all MTAs SMTP servers? Are any? Is there a difference between a mail transport agent and a mail transfer agent?
Can an MTA be ...
- 211
1
vote
2
answers
1k
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Exim4 and root aliases? Send a copy to root?
When setting up my raspberry pi to use local email (using exim4 as the default MTA on Raspbian/Debian), and while doing the debconf initial configuration, I was asked whether to forward root's email ...
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3
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3
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Why does cron use MTA to send emails, while we use MUA to send emails?
I have looked at the definitions of MTA, MUA, MDA, for example, https://ccm.net/contents/116-how-email-works-mta-mda-mua and https://en.wikipedia.org/wiki/Email_agent_(infrastructure)
In Lubuntu, the ...
- 103k
0
votes
1
answer
596
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Exim and Spam Filtering
for years I've been using Exim as MTA. I had three strategies to prevent Spam. First of all blacklists. The second was to delay the mail delivery and the third was SpamAssassin.
But this year, more ...
- 201