Thank you Matt, this will also help. BTW, for the curiosity, the "Merge
with an alternate user" option behaves the same way like
or does it have some extra functionality?

But my main focus with this question was about to help that desperate
users who make that typos to realize, that no mail will come to the
intended recipient. Something like warning "Hey, this address is not
valid so your answer never reach anybody".

Imagine sending some info (like "downtime will occur next monday") to
multiple recipients and one of them has a typo like invalid domain in
his mail address. You feel safe that you've sent info to everybody
important but someone never receive that and surely will complain during
the unexpected downtime.


On 5.1.2017 16:09, Matt Zagrabelny wrote:
> Hi Petr,
> We have this problem a lot.
> BP wrote us this module to help manage autocreated users that don't
> belong in the database:
> -m
> On Thu, Jan 5, 2017 at 3:53 AM, Petr Hanousek <> wrote:
>> Hi geeks,
>> sometimes someone here mistypes the mail address of Requestor or CC. The
>> typos in addresses are various, my question is about the really obvious
>> ones. Like if you put to CC an address "a@b". Is there any mechanism in
>> RT to detect such mistakes and say something at least? Or can I have a
>> feature request for this? :)
>> If you try this in Gmail or Thunderbird, an error is raised and the
>> message is not sent.
>> Thank you, Petr

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