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Questions tagged [sendmail]

General purpose email routing software that supports mail transport via TCP/IP using SMTP

sendmail is a popular Unix-based email routing facility that makes use of and supports the transfer and delivery of email via the Simple Mail Transfer Protocol (SMTP) and many other ways (e.g. UUCP).

sendmail exists both as free and open source software and as a commercial project, called Sendmail.

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"Sender address rejected: Null sender not allowed here" when forwarding e-mail sent from an gmail address

I'm trying to have an e-mail address at my @example.org forward to an external e-mail address outside my domains. When using my ISPs SMTP relay server, I get the following error: Dec 27 15:10:40 bowser sm-mta[76444]: 0BREAbT3071556:…
dadver
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Sendmail: How to connect to TLSv1.0

Is it somehow possible to make Sendmail (version 8.15.2-14~deb10u1) "speak" TLSv1.0 without changing the system default values in /etc/ssl/openssl.cnf (which will be MinProtocol = TLSv1.2 for my system)? I tried the following in…
manifestor
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Mail queue timing out with sendmail to port 465

I have a working sendmail installation that now needs to send to a different smarthost, on port 465 (instead of 25). I made the following changes to my…
TSG
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How can I check the outgoing HELO name of my sendmail server?

My email server got blacklisted and I get the following message from Zenhaus CBL: X.X.X.X. was found to be using the following name as the HELO/EHLO parameter during connections: "localhost.localdomain". Unfortunately there were too many requests…
manifestor
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Root mailbox permissions being changed

The permissions on my root mailbox /var/spool/mail/root (with user root:mail) are reset from -rw-rw---- to -rw------- whenever "Mail Delivery Subsystem MAILER-DAEMON@drjack.info" sends a message to it. This prevents mail sent to root@drjack.info…
user48297
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Email issues to a specific email provider (bellsouth.net) failing with "stat=Data format error"

I have a site that sends emails to users. One user in particular is not receiving emails. I have looked at the logs and I found: Nov 9 21:27:22 ******** sendmail[28960]: 0A9LRK37028960: to=**********@bellsouth.net, ctladdr=********** (1000/4),…
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Stop cron jobs from sending emails as root but allow sendmail to work

I've recently got Postfix working as a send only MTA relaying through Google Workspace (formerly Google G Suite). I would now like to send emails after completed cron jobs to my personal email. The problem I initially faced was that my server was…
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Why sendmail sending blank text file?

I want to create a script which able to send the log file by email. The problem now is the text file I have received through email is blank. Which part is the…
user591641
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EC2 Instance can't email it's own domain

I have SES setup with Sendmail on my EC2 Instance. It's working fine when I email any other domain, e.g. user@gmail.com. But let say my server's hostname is example.com, if it tries to email it's own domain, user@example.com, the maillog says "User…
Barry Ralphs
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Opendkim running but not signing?

I have had a lot of fun with OpenDKIM - it is actively running on my Debian box and here is my code: root@web1:~# tail -f /var/log/syslog | grep -i dkim Sep 7 16:35:38 web1 sm-mta[1504]: 087FZbYw001504: Milter insert (1): header: DKIM-Signature: …
Antony
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Deferred: Connection timed out

I am installing Sendmail on a Debian box. I have tried twice now and each time am getting the connection deferred error. I have run the following processes: apt-get purge sendmail* apt update apt install sendmail sendmail-cf m4 sendmailconfig (I…
Antony
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Sendmail: Reject Bare To: Headers

Is there a way in sendmail to reject messages with To: headers that don't include a domain name, rather than masquerading them? We have a broken client that uses the correct recipient address in the envelope, but sometimes sets the header To: field…
Juergen
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Reload sendmail when cert is renewed

Recently I upgraded Letsencrypt certs but forgot to restart sendmail. Is there an option in sendmail checking the cert files updated? The starttls.m4 contains this: define(`CERT_DIR', `/etc/letsencrypt/live/xyz') define(`confCACERT_PATH',…
Thomas
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Messages from [IP address] temporarily deferred due to user complaints

I have spent a solid 2 or 3 weeks following tutorials and going through trial and error trying to set up my own mail server using Postfix and Dovecot on Ubuntu 18.04. I finally have SPF/DKIM/DMARC records set up and outgoing mail from my server ONLY…
Cody
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Disable local delivery sendmail

I'm trying to disable local mail delivery on my sendmail server (CentOs 8). I've read many posts about this (for example: Disable local delivery in Sendmail) but non of the awnsers seem to work. I basically have a standard sendmail installation and…
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