Use Gmail to receive and send

[pjmagneto]

Hi

I have setup Mail in a box for one domain and everything is working fine except some users are going to use Gmail to send and receive these emails. so what i have done is i put the alias or forwarder to this users which forwards the email to their Gmail account and we added the emails@ourdomain.com to gmail send as settings.

The problem is while the aliases are configured on mail in a box when we end out emails using gmail we get the below error message
553 5.7.1 <pooya@tapia.com.au>: Sender address rejected: not owned by user [pooya@tapia.com.au)

but as soon as i remove the aliases send as starts to work, i have also tried using roundcube to forward the emails but i get the message that the gmail is not in the virtual alias table.

any help is appropriated

[alento]

Do not forward emails to Google. Google does not want them and will not accept them. In the end Google will eventually blacklist your IP which you do not want.

I would attack this in an entirely different manner. I would treat Gmail as my email client to read and send emails. This should accomplish what you want safely.

Here is a gulde on how to do it.

https://www.doteasy.com/domain-email-and-website-hosting-articles/importing-your-domain-email-account-into-your-gmail-account

I could explain why the settings you are using do not work, and will upon request, but I strongly urge you to switch to this method. This method is fully supported by Gmail and will not destroy your IP reputation with them.

[pjmagneto]

all good now, i was using the wrong port.