I bought a Brother ADS-1700W document scanner, so I can fully utilize my Paperless-ngx installation.
When scanning a document and sending it as e-mail, Mail 16.0 on MacOS 12.6.9 does not show the attachment of the scanned PDF document. Thunderbird, Claws Mail and K-9 Mail properly show the attachment.
I suspected something wrong with the e-mail and indeed got errors on mimevalidator.net:
Byteplant MIMEValidator V1.2.5.2 Errors: linebreak found, MIME syntax violation (line 1) linebreak found (line 2) linebreak found (line 3) linebreak found (line 4) linebreak found (...) parser error: too many bad linebreaks (line 45) MIME syntax violation: ';' expected (name) (line 45) MIME syntax violation: ';' expected (=) (line 45) MIME syntax violation: ';' expected (Scan_20230921_080714_000264.pdf)
I sent an e-mail to the Brother customer support (ADS-1700W is still supported) .. and they told me that on MacOS, only Thunderbird is supported.
My reply that the mail is invalid and that the scanner's firmware needs to be fixed by their developers were rejected. They did not even acknowledge the error; it seems their support staff did not even understand them.
Hierbei liegt kein Problem bei der Firmware Update und wie Sie schon
von meinem Kohlegin informiert worden sind, wird bei macOS nur Thunderbird
unterstützt,
wenn Sie mit Ihrer MacOS Mailprogramm Probleme haben dann müssen Sie sich
leider mit Apple in Verbindung setzen oder Thunderbird verwenden.
Bezüglich der Validierungsfehler müssen Sie auch bei Apple nachfragen
denn dieser Meldung ist leider nicht von dem Gerät.
Brother Support person, ticket 7001569466
Those bad spelling and grammatical errors were really in their email.
Mentioning the XKCD tech support keyword did not help :(