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Author Topic: Recommended PMTA config for Seznam.cz  (Read 4249 times)

jonathan@mailchimp.com

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Recommended PMTA config for Seznam.cz
« on: October 29, 2015, 03:44:46 PM »

We frequently encounter transient errors like the one below when delivering to Seznam.cz, though our bounce rate remains low:

451 4.3.5 Temporarily unavailable, try again later.

I was wondering if anyone has managed to identify a configuration that works well when delivering to Seznam? The frequency of those errors unfortunately kicks our IP's into backoff mode, causing some longish delays.
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Port25-Admin1

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Re: Recommended PMTA config for Seznam.cz
« Reply #1 on: October 29, 2015, 03:51:25 PM »

Have you signed up for their feedback loop?
https://fbl.seznam.cz/feedbackloop
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Port25-Admin1
------------------
Try the following commands:
Quote
pmta show topdomains --errors
pmta show topqueues --errors
pmta --help

When PowerMTA won't start use:
Quote
pmtad --debug
When all else fails-->support@port25.com

jonathan@mailchimp.com

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Re: Recommended PMTA config for Seznam.cz
« Reply #2 on: November 02, 2015, 05:20:36 PM »

Thanks for the reply. We should be receiving feedback from them for all our IP ranges. Our abuse rates also tend to be strong with them, and we handle greylisting correctly.

Based on the response I received from Seznam, those transient errors aren't volume-related, so there may not be a reliable workaround to avoid their greylisting. However, if anyone has found settings that led to improvements with delivering to Seznam, I'd be eager to hear it.

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