Hello,

Here a suggestion. How about incorporating some kind of verification email 
after the users' first email?

Something stating some obvious facts (like roundcube being only a client) to 
the user and asking him simply to reply if he has some other issue that is 
actually rcube related?

Again, this should be done only on first hit (new users only) and not on 2nd 
and so on..

My two cents..

On 13.03.2013, at 15:52, [email protected] wrote:

> Hi,
> We are experiencing a big problem when sending mass emails.
> We are sending 500 e mails daily and we noticed that after the 1st 100 e 
> mails  all the rest of e mails are returning to sender.
> We do not exceed the max ammount of 200 e-mails per sent mass email.
> Please we need urgent support with his issues, as we are in the middle of an 
> important marketing campaing.
> Looking forward to any sugestions you may have.
> Thanks
> Carmen
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