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Questions tagged [smtp]

SMTP is the Simple Mail Transfer Protocol, the most recent standard of which is defined in RFC 5321. It's the Internet standard for sending and receiving email.

3 votes
3 answers
2k views

How do you configure sendmail to reject Email with a Date header too far from real time?

A friend of mine using (I believe) qmail has it configured to reject, as SPAM, any incoming Email with a Date: header that is too far from real time. I can't figure out how to do this with sendmail. ...
Eddie's user avatar
  • 11.5k
10 votes
7 answers
4k views

Does SMTP greylisting a) stop much spam and b) stop much legitimate mail?

I've just set up an SMTP server on a relatively little used domain using Postfix and enabled greylisting with SQLGrey. So far it seems to be working OK, and while there's the slight irritation of ...
Whisk's user avatar
  • 1,903
2 votes
1 answer
6k views

IIS & SMTP: Long-delayed deliveries possible

Let me start by 'fessing up: I'm a programmer, not a system admin. (Although I used to be, over a decade ago. Let's be honest: That doesn't count anymore!) We had a situation with a client last night ...
John Rudy's user avatar
  • 243
7 votes
6 answers
3k views

Recommended personal mail server setup [closed]

I've been using GNU/Linux for servers, mostly Debian. I am thinking of keeping my personal email on a centralized server. I have some GMail accounts, and a few from different domains from several web ...
Fernando Briano's user avatar
10 votes
5 answers
3k views

Recommendations for SMTP services for massive mailing [closed]

What is the recommendations for SMTP services for massive mailing? Let me clarify, most of the free SMTP services (Gmail, Yahoo, Hotmail, etc...) has limits about the amount of messages you can send ...
Daniel Silveira's user avatar
1 vote
3 answers
2k views

SMTP Server: '421 unable to verify sender domain'

I have recently setup a new SMTP server on my new webserver (win 2008). The server sends mail from a number of domains hosted on the website, everything seems to work OK but I am getting a number of ...
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