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Jan 16, 2023 at 16:55 comment added Kamil @Giel SSMTP adds message id when necessary on my servers. I know I'm a bit late, but maybe someone else will neeed that information.
Sep 30, 2018 at 5:57 comment added bvj @RTF late comment, but likely possible using multipart/mixed. See unix.stackexchange.com/a/250189/182991
Oct 17, 2016 at 16:12 comment added RTF Any chance of an example with HTML message plus attachment(s)?
Aug 30, 2014 at 16:00 comment added Frederik Deweerdt The RFC 5322 says that the message-id should be present, but it's not mandatory. Most of the servers will add one for you if it isn't. I don't know if SSMTP adds one for you.
Aug 30, 2014 at 12:41 comment added Giel Message-ID is mandatory as well, or does SSMTP add it if necessary?
Aug 29, 2014 at 17:25 history answered Frederik Deweerdt CC BY-SA 3.0