Tag Archives: sendmail

Postfix Operational tips

Intro I’m trying out the system-supplied postfix on a SLES system. i had been using sendmail but there doesn’t seem to be any development on that software. Some commands I needed right away Well, right away I had thousands of … Continue reading

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Analysis of a spam campaign and how we managed to fight back for a few days

Intro A long-running spam campaign has been bothering me lately. In this post I analyze it from a sendmail perspective and provide a simple script I wrote which helped me fight back. The details Let’s have a look see at … Continue reading

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Analyzing the sendmail log

Intro If you’ve read any of my posts you’ll see that I believe sendmail is a technical marvel, but that’ snot to say it’s without its flaws. One of the annoying things is that the From line and To line … Continue reading

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The IT Detecive Agency: emails began piling up this week, no obvious cause

Intro Today I had my choice of problems I could highlight, but I like this one the best. Our mail server delivers email to a wide variety of recipients. All was going well and it ran pretty much unattended until … Continue reading

Posted in Admin, Internet Mail, SLES | Tagged , , | 1 Comment

Strange problem with email to paladinny.com

Intro This is probably the most obscure of all postings I will ever do – it’s really just opening up my private journal to the Internet, which helps me when I need to recall how I fixed something. So the … Continue reading

Posted in Admin, DNS, Internet Mail, SLES | Tagged | 1 Comment

The IT Detective Agency: mail server went down with an old-school problem

Intro I got a TXT from my monitoring system last night. I ignored it because I knew that someone was working on the firewall at that time. I’ve learned enough about human nature to know that it is easy to … Continue reading

Posted in Admin, Internet Mail, Linux, Network Technologies | Tagged , , , | 2 Comments

Yahoo! stopped accepting emails – what we can learn about sendmail from this

Flash Update I noticed yahoo.com, yahoo.ca and yahoo.com.br had stopped accepting emails today. I wanted to provide insight into this problem that few others would have, namely, when did the problem first occur? I looked at my stuck messages in … Continue reading

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54 Popular sendmail Features

Intro Thinking of replacing sendmail? Or switching to sendmail? Here are 54 features I find useful in the way I implement sendmail. In poorly ordered listing, we have: – minimal acceptable delivery speed: 100 messages/sec – queue deletion after 3 … Continue reading

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The IT Detective Agency: last letter of attachment name is missing!

Intro Today we bring you an IT whodunit thriller. A user using Lotus Notes informs his local IT that a process that emails SQL reports to him and a few others has suddenly stopped working correctly. The reports either contain … Continue reading

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How to run sendmail in queue-only mode

Intro I guess I’ve ragged on sendmail before. Incredibly powerful program. Finding out how to do that simple thing you want to do may not be so easy, even with the bible at your side. So to that end I’m … Continue reading

Posted in Internet Mail | Tagged , , , , | 4 Comments