Hi all,

Some users here got bounced mail with following error recently:

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This is an automatically generated Delivery Status Notification

Delivery to the following recipient failed permanently:

'user1 [at] abc.edu.hk'

Technical details of permanent failure:
PERM_FAILURE: Parse Error: Illegal To: address (invalid domain name):
'user1 [at] abc.edu.hk'
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I think the email address format is invalid. However, user didn't put
single quotes when they composed email. I've no idea when the quotes
are added and whether we can configure sendmail to accept it (I don't
want to do that but it was an order for me :( ). Would anyone please
help? Thanks a lot.

Sorry that if I'm posting to inappropriate group.

/ST Wong

> ---------------------------------
> This is an automatically generated Delivery Status Notification
>
> Delivery to the following recipient failed permanently:
>
> 'us... [at] abc.edu.hk'
>
> Technical details of permanent failure:
> PERM_FAILURE: Parse Error: Illegal To: address (invalid domain name):
> 'us... [at] abc.edu.hk'
> ----------------------------------- cut here

This notification was not written by sendmail, so we don't know
whether the software involved puts in extraneous single quotes when it
writes notifications. (Exchange does, for example.)

Sendmail would have rejected the message, so if this was sent out from
your host, the recipient address did not have single quotes around
it. You can check the recipient address in your system log.

The reference to "To: address" is unusual, because it seems to refer
to the header "To:" field. I doubt your system sent mail with a valid
recipient but not a valid "To:" field, since clients put the same
address into both places. You probably need to see the original
message to interpret what this means.

Joe Brennan