John Alex.:
> Hi, I encountered the same issue on two FreeBSD 13.1 + Postfix 3.7.2
> installations. It
> only occurs when trying to send an email with >4999 recipients (the mail
> queue is
> otherwise empty). This issue does not happen on another machine with FreeBSD
> 13.0 +
> Postfix 3.6.3.
>
> After some search I found that it is caused by the following addition in
> qmgr_message.c in
> 3.7 (line 441):
>
> if (strchr(expected_rec_types, rec_type) == 0) {
> msg_warn("Unexpected record type '%c' at offset %ld",
> rec_type, (long) curr_offset);
> rec_type = REC_TYPE_ERROR;
> break;
> }
>
> in combination with the pre-existing (line 385):
>
> /* Keep interrupt latency in check. */
> if (recipient_limit > 5000)
> recipient_limit = 5000;
>
>
> If I remove the code that was introduced in 3.7, the mail is delivered
> without issue. I
> also tried changing 5000 to 10001 and the email was again succesfully
> delivered to up to
> 10000 recipients.
>
> So it seems this issue occurs whenever the mail queue total recipient count
> reaches 5000
> addresses.
Thanks, that is very useful. This appeats to be a corner-case error,
and that woiuld explain why the problem was difficult to reproduce.
How was your Postfix queue file with 5000 recipients created?
- with Postfix virtual_alias_maps expansion,
- with Postfix alias_maps expansion (/etc/aliases),
- by submitting a message with 5000 recipients over SMTP?
- ??
I prefer not to remove the new sanity check, but instead fix the
corner-case error.
Wietse
