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Undeliverable or bounced emails to recipient's mail servers are due to your mail server identifying itself as an internal mail server with an IP address 127.0.0.1
This Page> Most common reason for undeliverable mails
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  Page 1- MX records or Mail Exchangers

Page 2 - If there are no MX records?
 

About bounce or undeliverable emails?

Mail Servers FAQs
If you are using your Desk-Top PC with a mail server program to send emails the most common problems for undeliverable emails are identified here, please go through them carefully and it will solve most of your problems.

 
 
Most of the time, undeliverable emails to recipient's mail servers are due to your mail server identifying itself as an internal mail server with an IP address 127.0.0.1 and can be solved by using an actual IP address.  
 
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Actual IP Address?

For example; using an invalid and non-existing, email address in the REPLY TO: or FROM: field or using web-based free email address with no MX Records or the email address at the FROM: field that is different from the login IP address (login in using your ISP account and using an email address from another ISP account).
See:
Email Filtering and
How does my email gets to the recipients?

Every ISP has their own standards and ways to filter spam, therefore, by clearly identifying yourself at the FROM: field for most web-based email recipients like: Hotmail, Yahoo, etc., may not work with many ISPs or the other way round.

You may need to segregate your email address lists, as well as to keep in mind that ISPs also limits accessibility to their mail server by time and quantity of mails (it doesn't matter whether you are using your own PC mail server or your ISP mail server).

Therefore, you need to experiment by using a combination of different strategies for different popular web based email recipients.

Notes:
ISPs DNS server IP Address have nothing to do with the process of email message delivery. It merely serves to turn the
IP address--a series of four 8 bit numbers, ie: 151.196.75.10 into a domain name www.me_my_domain.com

 


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