Hi Dmitry, I asked the infra team about it but they were a bit slow to answer… (they just checked today!). And now they’ve lost the logs (which have rotated since then). What they said though is that "Usually, the spam check is based on the content, so it's very likely that the content of the email was the cause of the issue.”. Since you didn’t provide the content of the faulty mail it’s hard to check afterwards.” They recommend resending an email to the list and seeing if it works.  Have you been successful in sending other mails to the list in the meantime? Thanks -Vincent On 1 Feb 2015 at 10:51:59, Dmitry Bakbardin (haru_mamburu@mail.ru(mailto:haru_mamburu@mail.ru)) wrote: