The way we look at it, any 'client' or script SHOULD add the
Message-ID.. Any MTA relaying a message without one, MUST add one, or
MAY NOT accept it.. eg, not accept non-smtp authenticated messages,
without a Message-ID, or add ones to messages that are smtp
authenticated, eg from clients..
Pure 'relay' MTA's should do a service to their customers, and reject
when their customers attempt to send an email without the Message-ID, so
the customer can properly format their messages.
(The might have forgotten the Date field too ;)
On 18-03-19 02:12 PM, Steve Atkins wrote:
On Mar 19, 2018, at 1:56 PM, Rob Nagler <[email protected]> wrote:
Our mail software drops messages that have missing Message-IDs. However, it
seems that sites like etrade.com and authorize.net have started sending emails
without Message-ID fields. We also have a legitimate bounce from
[email protected] without one. There also seems to be a Samsung Galaxy
MUA that is troublesome (not sure why the MTA doesn't add one...).
There've always been a scattering of sources of legitimate email that don't
have message-id, but I'm a bit surprised to see etrade and authorize.net doing
that. I wonder if there's a common vendor that has a problem?
It seems Message-ID is a "should" field so our software shouldn't require it. However,
many mailers and spam filters treat Message-IDs as "must". We'll probably just add one,
because some of our users are starting to get frustrated with mails getting dropped.
Yup.
Is adding a Message-ID field a reasonable idea? Alternative suggestions?
Accepting and delivering mail without a message-id that otherwise looks likely
to be wanted is a good idea. Adding a message-id to avoid nasty edge cases in
MUAs you deliver it to is a good idea, if it's not too painful to do.
Cheers,
Steve
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