Hi, Andy Beverley - Simplelists via mailop wrote on 17.10.24 at 15:15:
I posted this response a while ago to another query, copying now in case it's the same issue:
thanks for this!
I had a problem a couple of years ago with Mimecast marking some DKIM-signed emails as failing, even though they passed everywhere else. After escalating the ticket several times and with a lot of insistence from us, Mimecast eventually admitted that "the cause of the issue is our limited support for 8bit encoding". At the time they said that "no ETA has been shared with us but the engineering case has been open for quite some time". I don't know if it ever got fixed, as we worked around it. Maybe that could be the same issue?
If you refer to Content-Transfer-Encoding, most users use Thunderbird, which by default uses 8bit encoding, so it could be possible. The others use Roundcube, which IMHO has the same default. If that would make DKIM fail, that would be really odd...
How did you work around it with Mimecast, if I may ask? And what's the best way to open a ticket there? https://community.mimecast.com/s/sender-feedback seems to need soem Mimecast admin to file/confirm it, if I understand properly.
Thanks Florian _______________________________________________ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop
