How DNS2Go works with an Email Server

Article Details

URL:	https://support.deerfield.net/support/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=593
Article ID:	593
Created On:	Jun 18, 2007 01:43 PM

Answer

When using DNS2Go along with an Email Server

Your domain must be configured in your mail server to be able to receive mail. If your domain is not configured in the mail server, then its very likely that your mailserver will reject the message.

When the DNS2Go Client goes online, the DNS2Go Client will create a default MX record, resolving to the domain name that DNS2Go brings online:

Non-authoritative answer: domain.d2g.com MX preference = 10, mail exchanger = domain.d2g.com

This record will direct all SMTP mail traffic destined to domain.d2g.com to domain.d2g.com. The record is created this way when domain.d2g.com's IP address changes the MX record will stay current.

When domain.d2g.com goes offline, the MX record, by default, will be removed and no MX record will be present. Changing offline options in the DNS2Go Account Manager can modify this. When there are no MX records for a domain then no email will be received by the local mailserver and will most likely bounce back to the sender of the original message with a delivery error

To modify the Offline MX record options, login to the DNS2Go account manager via this link. Once logged in, Select your domain from the list of domains and then expand the When this domain goes offline, select from one of the following:

• Remove MX record, this is the default option.
• Retain the Online MX Settings, this option would keep the MX record that is created when the domain goes online.
• Custom MX settings. Custom MX settings can only be used when you have a Professional Account.

When email is sent from an Email Client, it will reach the outgoing MailServer defined in the Email Client, and then sent out using DNS resolution finding out the MX record. Inbound mail will come into your Mail Server on port 25 when your server receives mail directly. Once your Mail Server has received the message, the Email Client will initiate a connection on port 110 (POP3) and receives the message. POP3 is only used when receiving email from the mail server to a mail client.

DNS2Go offers a Value Added service named Email Routing that will allow our mail servers to act as a backup mail server. If Port 25 were blocked for incoming connections (inbound mail) then our mail server would accept the message and your server would collect the mail via POP3, ETRN or ATRN.

Email Routing will also be beneficial when port 25 is blocked for outbound traffic on port 25. Email Routing would allow your mail server to send or relay your outbound mail through our servers here.

More Information regarding Email Routing is available here:

Email Routing