Dear Community,
The RFC standards mandate that no line longer than 999 chars may appear in
the raw message contents.
When a mail with more than 20 or 30 recipients is being sent, the length of
the "To:" or "Cc:" may reach that limit and needs to be split in order to
fit.
Other mail programs than K-9 tend to enumerate all the recipients one per
line, each line ending with a comma when continued, and each continuation
line starting with one or more spaces.
In opposition, K-9 places all the recipients in one single big line, then
splits it in fragments of 999 chars. Lines of more than 975 characters seem
to break downstream SMTP servers (Postfix ? OpenDKIM ? Postgrey ?)
Has someone experienced in such cases pieces of the header appearing in the
e-mail body ?
Has someone to complain that Gmail reject messages with the following error
message ?
host gmail-smtp-in.l.google.com[108.177.127.27]
said: 550-5.7.1 [111.222.34.56 11] Our system has detected that this
message is 550-5.7.1 not RFC 5322 compliant: 550-5.7.1 'From' header is
missing. 550-5.7.1 To reduce the amount of spam sent to Gmail, this message
has been 550-5.7.1 blocked. Please visit 550-5.7.1
https://support.google.com/mail/?p=RfcMessageNonCompliant 550 5.7.1 and
review RFC 5322 specifications for more information. l26-v6si3298123eji.29
- gsmtp (in reply to end of DATA command)
Thank you all,
Frédéric
Belgium
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