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Best MailFail Alternatives
Here are some Firefox add-ons that are similar to MailFail:
Email Verifier
Devro LABS
18 5.00 
(1) 
Mail Validator
Gaurav Yadav
1 0.00 (0) 
MailMess
IRoan
1 0.00 (0) 
DNS Medic
jstoneky
8 5.00 (1) 
Mailman Moderation
Maximilian Wende
3 0.00 (0) DDoS Protection Checker
Jimmie Edwards
1 1.00 (1) Email Header Analyzer
Libor Benes (Dr. B)
5 0.00 (0) Smart Email Validator
LOUngviet20
- 0.00 (0) 
MailHops
Andrew Van Tassel
5 4.08 (26) MetaSpy - Protection
Alain Picard
- 0.00 (0) 
Trusted Email Sender Check
Dave
5 5.00 (3) Mail Safe
Sappadaorgvn
- 0.00 (0)