On Sun, 2021-04-04 at 07:03 -0600, Anthony J. Bentley wrote:
> Hi,
>
> I had an interesting occurrence today... I was performing an action
> that required a confirmation code from my bank, which they sent by
> email. Unfortunately the mail never arrived, because:
>
> Apr 4 03:25:16 axx smtpd[59645]: fdc8f818f7adb2aa smtp failed-command
> command="RCPT TO:<"username"@example.com>"
> result="501 5.1.3 Recipient address syntax error"
>
> I assume the double quotes in there were the problem. I had to switch
> to a GMail account to receive it.
>
Since everyone responding likes to point to what might be a nice and
comfy workaround, let me take some inspiration from RFC5321.
>From section 3.3:
RCPT TO:<forward-path> [ SP <rcpt-parameters> ] <CRLF>
So let´s expand forward-path from section 4.1.2:
Forward-path = Path
Path = "<" [ A-d-l ":" ] Mailbox ">"
Mailbox = Local-part "@" ( Domain / address-literal )
Local-part = Dot-string / Quoted-string
; MAY be case-sensitive
Quoted-string = DQUOTE *QcontentSMTP DQUOTE
In other words: the bank is correct (although maybe a little unusual)
to use a double-quote surrounding the local-part. This should be fixed
in smtpd.
I´m not very familiar with that part of the code and I don´t know when
I have the time to look into it. If anyone else beats me to this I would
most welcome it. :-)
martijn@
