= bug description =
I've begun to receive multiple "Undelivered mails returned to sender" mails from askfedora since the mailing system was fixed.

= bug analysis =

I'm not sure if this is an issue with askfedora, or if the accounts it's trying to send mail to do not really exist.

Examples:

{{{

This is the mail system at host bastion01.phx2.fedoraproject.org.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

               The mail system

wixec13@yahoo.com: host mta7.am0.yahoodns.net[98.136.216.26] said: 554
delivery error: dd This user doesn't have a yahoo.com account
(wixec13@yahoo.com) [-5] - mta1042.mail.gq1.yahoo.com (in reply to end of
DATA command)
}}}

{{{
This is the mail system at host bastion01.phx2.fedoraproject.org.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

               The mail system

e1015268@rmqkr.net: host mail.digitalsanctuary.com[174.37.94.132] said: 550
5.1.1 e1015268@rmqkr.net: Recipient address rejected: User unknown in
virtual alias table (in reply to RCPT TO command)
}}}

{{{
This is the mail system at host bastion01.phx2.fedoraproject.org.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

               The mail system

dsfdsds@gmail.com: host gmail-smtp-in.l.google.com[74.125.25.27] said:
550-5.1.1 The email account that you tried to reach does not exist. Please
try 550-5.1.1 double-checking the recipient's email address for typos or
550-5.1.1 unnecessary spaces. Learn more at 550 5.1.1
http://support.google.com/mail/bin/answer.py?answer=6596
fd8si6735711pad.162 - gsmtp (in reply to RCPT TO command)
}}}

{{{

This is the mail system at host bastion01.phx2.fedoraproject.org.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

               The mail system

carried.away.butterly@gmail.com: host
gmail-smtp-in.l.google.com[74.125.25.27] said: 550-5.1.1 The email account
that you tried to reach does not exist. Please try 550-5.1.1
double-checking the recipient's email address for typos or 550-5.1.1
unnecessary spaces. Learn more at 550 5.1.1
http://support.google.com/mail/bin/answer.py?answer=6596
kx5si6219707pbc.110 - gsmtp (in reply to RCPT TO command)
}}}

I've been getting many of these, bouncing off various email addressses. It's unlikely that all these email addresses are invalid (I think).

= fix recommendation =
Not really sure. I'm really happy that the mail notification is back up, but getting a lot of these mails is slightly annoying. Is it possible to just disable bounces. I mean, if someone else didn't get the notification, I really don't need to know about it. (The concerned person needs to update his/her email to a correct one)

We already have a thread on askfedora where I see people disgruntled by notifications. Them getting these bounces is going to make it worse :(