Erro SMTP (450)

[rafaballack]

I can't send emails but can receive. Displays the message: SMTP Error (450): failed to add the recipient

"myemail@hotmail.com" (4.7.1 <xxx.208.26.82>: Helo command rejected: Host not found).

[aeanez]

hi rafaballack,

maybe you set "Reject Unknown Hostname" in postfix manager menu,

try to find and comment # this line

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reject_unknown_helo_hostname

in /etc/postfix/main.cf an then

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service postfix restart

[Administrator]

or rebuild mail server without that option.

[rafaballack]

hi rafaballack,

maybe you set "Reject Unknown Hostname" in postfix manager menu,

try to find and comment # this line

Code Select Expand

reject_unknown_helo_hostname

in /etc/postfix/main.cf an then

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service postfix restart

Worked!
But when sending any email, does not receive

[Administrator]

you should check mail server logs and your dns records.

[Freespirits_GR_Host]

I see the following error

smtp 450 failed to add recipient 4.7.1

even though the following parameter is disabled and not used

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reject_unknown_helo_hostname


The problem appears even when i try to add recipients from the same hosted domains in the server. 

[umtu06]

i am getting the same error. I noticed that the hourly postal quota is full. Here are my LOG records. What should I do to get rid of them?

helo=87-207-170-128.dynamic.chello.pl, from=qdzftt632@3he.com.tr, to=qdzftt632@3he.com.tr,

[overseer]

try to find and comment # this line

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reject_unknown_helo_hostname

in /etc/postfix/main.cf an then

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service postfix restart

If it exists, I would also suggest commenting out:
#reject_non_fqdn_hostname, # too many misconfigured servers out there...

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