> when in Thunderbird someone uses the "Custom From Address" feature, it > doesn't change the envelope sender, but only the actual "From" header > field
are you sure? I just tested with my TB (60.0) under Linux (Fedora 28) and found that both (envelope from and from header) are changed to the value I defined in "custom from address" Btw: at least the Thunderbird question should go to a thunderbird mailing list. Not really a postfix issue here :-) Cheers tobi Am 03.10.18 um 17:33 schrieb Stefan Bauer: > Johannes, > > did you double check if your planned setup will not break other things? > > Have similar needs but am not yet deep enough into mail to see possible > pitfalls. > > Stefan > > Am Dienstag, 2. Oktober 2018 schrieb Johannes Bauer : >> Hi list, >> >> I'm having an issue with my Postfix configuration: Currently I've it set >> up so that one authentication SASL login (e.g., m...@foo.com > <mailto:m...@foo.com>) supports >> multiple virtual email addresses (e.g., m...@foo.com > <mailto:m...@foo.com> but also >> f...@foo.com <mailto:f...@foo.com>, b...@foo.com <mailto:b...@foo.com>). >> >> Once authenticated with m...@foo.com <mailto:m...@foo.com>, the > envelope sender ("MAIL FROM") >> is restricted to only the permissible variants. >> >> However, as I've now painfully found out, when in Thunderbird someone >> uses the "Custom From Address" feature, it doesn't change the envelope >> sender, but only the actual "From" header field. This means, I have the >> following situation: >> >> Auth: m...@foo.com <mailto:m...@foo.com> >> Envelope from: m...@foo.com <mailto:m...@foo.com> >> Header 'From': anyth...@goes.com <mailto:anyth...@goes.com> >> >> One of my customers used a gmail address in the header "From", sent an >> email to @hotmail.com <http://hotmail.com> and now my mailserver is > permablocked at Microsoft >> for bad reputation. >> >> How can I ensure in the future that the same checks are applied to the >> Header "From" field that are also applied to the evelope "From" field? >> >> Thanks, >> Johannes >>
