smtp - is this bad for deliverability?

i just had an email service provider tell me that smtp is bad for deliverability? then why many of the email service providers offer this feature. i think they are just trying to use fear to sell thier product.

but i want to make sure because im planning on using smtp for things like mailjet, mailgun, etc
finnstoneAsked:
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DarinTCHSenior CyberSecurity EngineerCommented:
so they might be pushing the idea that they will receive the mail and you can use their product as a smtp relay or as the mail exchange or even use their version of webmail
check out our article 'a crash course in SMTP' if you want a little more
but either way it needs to be processed as a mail protocol in the first place

so their claims sound a little fishy --- unless the care to explain further in better detail
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DarinTCHSenior CyberSecurity EngineerCommented:
i guess i would have to ask what they propose instead
SMTP Imap and POP3 are the most popular mail protocols
....that being said YES there are smtp vulnerabilities
and yes port 25 and port 80 deliver approx 80% of known malware
but a good application firewall can offer decent security
alll 3 of these protocols have known limitations but again what are they suggesting as
viable alternatives - the world continues to use these protocols
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finnstoneAuthor Commented:
yeah i dont understand what they are saying. they are suggesting i use their servers i guess...but i can do that with SMTP
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gheistCommented:
SMTP is only email delivery protocol.
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