On 2015-08-28 12:30, Wietse Venema wrote: > Per olof Ljungmark: >> Hi, >> >> We have a problem with one receiving domain, we see a bounce as in the >> subject. >> >> I think this is an Exchange server that forwards the message to another >> Exchange box that refuses to receive it. > > This crappy behavuior is permitted by RFCs: a forwarder either > converts 8-bit content to 7-bit (like Postfix does) or it > returns the message as undeliverable. > > You can force Postfix to do the 8-bit to 7-bit conversion with > smtp_discard_ehlo_keyword_address_maps or smtp_discard_ehlo_keywords > (discard the 8BITMIME announcement). >
Yes, that helped with Thunderbird but not from Horde/IMP where it still bounces the same way. The difference seems to be that IMP sends a "Content-Transfer-Encoding: quoted-printable" and TB "Content-Transfer-Encoding: 8bit" Could this be the cause?
