Recent Rise in Hanging SMTP Connections
A few customers of MPP have recently reported issues with SMTP connections hanging. I found an interesting advisory, that while specifically targeted to Postfix, there is information relative to all email server admins. The author mangled 3 distinct topics together, but it is a good read:
Postfix Mailservers Under Stress
Anyone that runs and smtp server is vulnerable to the issue of smtp connections that aren’t closed properly. The report of a huge increase in broken smtp connections is relative to anyone.
The bit about policyd is interesting, but as you point out, it is not relevant to most people. Heck, we even think our policy server is much better, especially with the integration with our content filter and cool rate limiting capabilities, which can be tied to spam count and connection count.
Lastly, the description of how to tune Postfix is interesting to all Postfix ops, though there is an interesting fact mingled in that relates number of open smtp connections to how the linux kernel is configured.
To me, the bottom line is that even with more antispam companies than taco bell’s the spam problem is growing at an incredibly rapid pace.
Technorati Tags: postfix, email security, antispam, mpp, spam
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