How to add user in Rainloop like admin#domain.com - centos

I was using usermin in my VPS server, but its interface was not up to mark. So, I've installed Rainloop webmail server for one of my domain.
But I am confused about how to add a user to send and receive mail like I used to do with usermin.
Suppose I have a domain called example.com, I want to access a user contact#example.com to rainloop. I want to send and receive mail via contact#example.com.
I can send and receive mail via the same user in usermin, but I don't how to do the same with rainloop.
I am using centOS in my VPS server.

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How to route mails outside Mac Os X Server host

I have a mac osx server at my office. I have only one email address configured on it because it's an email address outside my GSuite account. That email address was created for sending mails from a php script (I don't want to pay to Google for that email address because I don't need all of the Google Services on it). I configured PHP Mailer for sending mails using that email account.
It's connecting perfectly fine, authentication is correct, etc., but there is one problem: if I send mails to #mydomain.com it says that account doesn't exist, but it does exist, only that it is hosted on GSuite. If I send mails outside mydomain, it works fine.
Question is: how do I route those mails to look up for the correct MX récords? I mean, how to make those #mydomain.com emails reach the GSuite host?
You can have multiple MX records per domain. It is possible. They will use priorities. You can even have multiple email servers checking emails from each other.
However, you case with hosted emails this won't work. Google is not going to let you do this.
You will have to pay.

Can I use mix of GSuite and my own server to send emails?

I am hosting my email address, for example, arvind#mydomain.com on Gsuite.
How do I add more addresses in my server such as abc#mydomain.com and use my own server, such as my website to send emails to this user. I created abc#mydomain.com using WHM/cpanel for the domain. I am able to send email from this address but they end in spam folder. Also I am not able to send emails to this address.
I have added Google's server to MX entries and my own server such as mail.mydomain.com. However if I try to send email to abc#mydomain.com it fails with "Address not found".
How can I fix it? I am able to edit DNS entries if required to.

Unable to connect to the email server (pop3) with Gmail

I am trying to connect to a secure outgoing server(pop3 port) of my website to receive all emails to my Gmail inbox.
but in my web control panel, the name of the outgoing server is "centos-2gb-nbg1-4" without any domain name or domain suffix in end. I am unable to connect to the server with Gmail when I put the exact name(centos-2gb-nbg1-4) copied from web panel to Gmail. Is anything should be added before/after this outgoing server name before putting in gmail? like this: centos-2gb-nbg1-4.example.com ?
Your outgoing mail server is to send mail out, in your question above you are requesting to receive e-mail to your inbox, so you want to login to your cPanel of your website lookup your Mail settings for your server and look for "Incoming Mail Server" and Port. That is the value you need. To check outgoing, look up your DNS records within your CPanel, it usually is "somevalue.your-domain-name.com" (mail.example.com, or smtp.example.com). Your webhosting provider support team can help with specifics.

Sender dependent relaying on Zimbra 8.7? Can it be done?

I had a server running Zimbra 8.6 and it was configured to send via any one of five external relays based upon which one of my external accounts I was sending from. This worked great until I had a server crash and rebuilt this one using the latest Zimbra 8.7.
I have read and researched and tried everything I had done for my old 8.6 system and I simply cannot get this to work! When I try to send an email from the web client to gmail I get a warning from gmail that my server's IP address and domain are not allowed to relay since they are unauthenticated. According to my postfix configuration I should be authenticating using my own gmail credentials. But, the web client seems to ignore this.
When I try logging in directly on the Zimbra box I can use sendmail with the -tf parameters to mock up an email from one of my addresses to gmail and it works just fine. It is sent and looks like it came from the proper relay domain.
Is sender dependent relaying broken on 8.7? Does it work for anyone?
Welp, I gave up and set my server up to use gmail as the external relay for all accounts, and in my admin console I set my user account to be able to send from all of my external email addresses (specifying each of them there).
Now it properly relays through gmail and still shows each message as coming 'from' the external account I select in the new message window.
Maybe this will help someone with a similar issue.

Sending email CPanel

the problem is this:
I need to send an email to a Google Apps account with the same domain that I have delegated to our server from CPanel.
The problem is that when I send an email from no-reply#mydomain.ie (email server) to support#mydomain.ie (gapps email) [same domain, different servers] not from the server, but it tries to find "support" on the local server and can not find (No Such User Here).
Is there any way from CPanel, so that if the user does not find email (support), send it the same? Considering that to send email no-reply#mydomain.ie have the account and use local data.
Thanks!
Alejandro.
I believe you are using Google Apps for email service. It seems that your mail exchanger is set to local in your cPanel.
Go to WHM -> Edit MX and edit this domain. Here you will get an option to set remote mail exchanger for your domain.