Is sendmail safe for SMTP?

Peter Farrow peter at
Fri Apr 18 10:30:02 IST 2008

Michael St. Laurent wrote:
>>> I've been using an SMTP proxy for years now but have been having
>>> problems with it lately.  So I am wondering if it is safe to let
>>> Sendmail talk SMTP to the outside world these days or if 
>> that is still
>>> considered a Bad Idea(tm).
>> Sendmail is the most widely used MTA on the internet (>60%), when 
>> vulnerabilities have been discovered in the past they were fixed very 
>> quickly.
>> Not sure where you get the concept "  *Still* a bad idea", 
>> its the MTA 
>> of choice in my book and has been for over 10 years and 
>> facing it on the 
>> internet correctly configured has never been a bad idea...
>> Sendmail is over 25 years old and is still the number 1, its the most 
>> configurable and provides the best functionality....
>> A lot of sys admins are cautious of it because they don't know how it 
>> works well enough... but its like anything these days once 
>> you know how 
>> to use it, its very simple to make it do what you want...
> Oh, I can make it do what I want.  But when I first put things together
> here I didn't have time to do a lot of research and there were some high
> profile incidents took place involving Sendmail exploits.  In any case,
> using a proxy sounded safer than *not* using one.
> I hope the "Bad Idea" comment didn't give offense as it was not intended
> to be any kind of a dig against Sendmail.

No offence taken, just wondered/interested if someone had given you a 
reason not to use it, in which case I would be interested to hear what 
it might have been...



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