Mail Group Duplicate Problem;

[exevolium]

Hello,

We use Mailenable Standard Edition v. 9.11. When we send a mail to our mail group, there are two mails.
Exchange and hMail are not experiencing this problem either.

Problem details: We would receive two emails when we sent an email to mail groups and the mail address that includes in that group. There are no duplicates in hMail and Exchange services.

Is there any solution for that?

*There is no redirect except for mail group redirect.