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1answer
14 views

Google gmail block for no ptr of 4to6 ip address

When mail server got only ipv4 address and enabled 4to6 interface, gmail server block mail because of no ptr record of 4to6 address. Why...? Isn't 4to6 address not global standard...?
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1answer
91 views

rDNS setup to prevent emails appearing as spam / phishing messages

We are trying to send email without the email appearing in the spam folder. The emails that we are sending is solicited bulk email. The main problem is that the emails are appearing as phishing ...
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1answer
364 views

Is it safe to use ptr in SPF?

Suppose you have the domain yourdomain.com, and you have set the following SPF: v=spf1 +ptr:yourdomain.com ~all Now, I have the IP address 1.2.3.4, and I am also the administrator of ...
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3answers
1k views

Hotmail wants me to modify my SPF record

This is my current SPF record. It works well with gmail and yahoo but hotmail was ignoring. So i used their submit system and now they replied me with the text below. This is my current spf v=spf1 a ...