Seems that any mail with size larger than PostMasterPOP3MaxEmailSize: 2048 is simply LOST..
I have tested with a mail of :
bash-2.03$ tail -f /var/log/syslog | grep -v pop
Aug 24 10:48:55 dingo sendmail[23490]: [ID 801593 mail.info] k7O8mWW7023490: from=<xxx@here.com>, size=3114554, cnrcpts=1, msgid=<D1794DC5735DC9429474BE0371DEF457054835AD@bemem.com>, proto=ESMTP, daemon=MTA, relay=mail.xx.com [22.222.222.22]

Aug 24 10:48:59 dingo sendmail[23564]: [ID 801593 mail.info] k7O8mWW7023490: to=<otrs@dingo.xx.ss.com>, delay=00:00:2y=00:00:04, mailer=local, pri=3144757, dsn=2.0.0, stat=Sent

So the mail IS delivred

But nothing is shown in any queues!??
And there is reaction from OTRS, such as retuning the e-mail with an error?
Is there a way to return the mail with error messages?

Andre