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corecode / dma

The DragonFly Mail Agent, a small Mail Transport Agent (MTA), designed for home and office use.
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Multiple addresses in RCPT TO: #73

Closed jailbird777 closed 4 years ago

jailbird777 commented 4 years ago

Looks like Netscape/Sun/iPlanet/Oracle SMTP server doesn't like multiple addresses in a RCPT TO: line. Eg, it'll completely reject:

RCPT TO:addr1@example.com,addr2@example.com,addr3@example.com

But it WILL accept multiple RCPT TO:'s with one address each, eg:

RCPT TO:addr1@example.com RCPT TO:addr2@example.com RCPT TO:addr3@example.com

it looks like sSMTP does the multiple RCPT TO thing, probably for the same reason (or maybe so that it can tell which addresses get accepted and which don't?): https://github.com/ajwans/sSMTP/blob/master/ssmtp.c#L1642

I did the same basic hack locally to dma to make it work the same way, pull out a nasty strtok() for a comma :(.

jailbird777 commented 4 years ago

RFC5321 section 4.1.1.3 https://tools.ietf.org/html/rfc5321#section-4.1.1 seems to explicitly require one address per RCPT TO, so it seems like the existing dma behavior is non-compliant.

corecode commented 4 years ago

please share your patch in a pull request.  Why do we even have multiple RCPT TO?  shouldn't the mail have been split up into multiple deliveries?

On 01/02/2020 07:24, jailbird777 wrote:

RFC5321 section 4.1.1.3 https://tools.ietf.org/html/rfc5321#section-4.1.1 seems to explicitly require one address per RCPT TO, so it seems like the existing dma behavior is non-compliant.

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jailbird777 commented 4 years ago

PR @ https://github.com/corecode/dma/pull/74

It looks like the only splitting is when sending to different multiple hosts. In the case of multiple addresses to the same MX or using smarthost, it doesn't appear that it's normally split up.