Hi Team Just a follow up on that case, as from the feedback I got it looks others are also affected by this problem.
I finally managed to get the attention of an Amazon SES Tech who agreed to look into the issue and got an explanation of what most probably happened. Amazon SES does NOT block whole destination domains, but only single email addresses which 'bounce'. One single bounces causes the destination address to be put on a 'suppression list' for a day or so. The sender just sees a non descriptive delivery error but has no information of the exact cause or exact reply of the rejecting email server. If a destination bounces more than once, the timeout of that list is massively increased, up to several months. As mentioned, we observe a lot of spam from Amazon AWS IP Ranges and feed our anti-spam blacklists from such emails. So it might be, that the mostly affected customer of Amazon SES shared the IP with a spamer in the past and thus the sending IP Address was blacklisted for some time on our platform, which caused the bounces and thus the affected destination email address from our customer being put on that suppression list with an expiry date far in the future. Anyway, according to Amazon SES the bounce events must have been so far in the past, that Amazon cannot find them anymore in their logs. In the last couple of days, the email address of our customer got automatically expired from that suppression list and latest test shows, the Amazon SES customer can again successfully send emails to our customer. What still is very unfortunate is how the Amazon SES Tech first replied to the case opened by their customer and was blaming us to be the 'cause' of the problem and urging their customer to tell us to 'fix' the 'MX' problem without giving him or us any details about the origin of the problem. Mit freundlichen Grüssen -Benoît Panizzon- -- I m p r o W a r e A G - Leiter Commerce Kunden ______________________________________________________ Zurlindenstrasse 29 Tel +41 61 826 93 00 CH-4133 Pratteln Fax +41 61 826 93 01 Schweiz Web http://www.imp.ch ______________________________________________________ _______________________________________________ mailop mailing list mailop@mailop.org https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop
