Email deliverability and ReturnPath.net certification

Hi experts,

About email deliverability and ReturnPath certification:
1. It's 100% necessary the Return Path certification?
2. What are the characteristics of this certification?

Best Regards,
SF
sergiofuentesAsked:
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Dave BaldwinFixer of ProblemsCommented:
It is not necessary, it is a commercial program to provide whitelisting.  http://www.returnpath.net/commercialsender/certification/  I think I can guarantee you that not all of the people you send email to are using it.  Maybe even none of them.

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SandyCommented:
Not all the time but yes still if you have any mail header which can brief us about you requirement then surely we can help.
sergiofuentesAuthor Commented:
OK Thanks experts
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