How reliable is validating email domain by reverse DNS MX record checking
5327
Fighting Spam - What can I do as an: Email Administrator, Domain Owner, or User?
116606
On what criteria should I evaluate domain registrars?
119731
Postfix check outgoing mail for spam
59661
Top level domain/domain suffix for private network?
62470
Understanding the impact/risk of turning off "verify backup integrity" on SQL backup
15844
How can I prevent Postfix from accepting mail from domains it owns, that it didn’t send?
69576
Why is SPF being validated against my mail server's IP instead of sender's IP?
150090
Should I sanitize an email address before passing it to the is_email() function?
2101
How to validate an email address in JavaScript
46233
Can a DNS wildcard only be the leftmost part of a record?
106706
Is stage.*.example.com valid for a wildcard DNS CNAME?
120667
Detecting Outlook autoreply/out-of-office emails
71454
What is the role of NS records at the apex of a DNS domain?
25161
How to check if an email address is real or valid using PHP
6174
How to check if an email address exists without sending an email?
134094
Is it possible to find all DNS subdomains for a given domain name?
157313
Is it worth obfuscating email addresses on the web these days?