postfix error 450 4.3.2
by vinmansbrew from LinuxQuestions.org on (#6EQGF)
trying to get an smtp relay server set up. I have a current rhel 6 server for this, so it's obvious why I am doing a new 1. :)
The new server is rhel 8.8, with postfix-3.5.8-4.el8.x86_64.
I am currently working on testing, using telnet to try and send mail to an exchange server.
Telnet connects, I can EHLO and MAIL FROM:, fine.
It's when I do the RCPT TO: and then put in any email address, I get:
450 4.3.2 Recipient address rejected: Try again later
Now, there is no dns record for this server, as once it successfully sends mail, it'll get the old server's hostname and IP. So, my co-worker added the current IP, as an accepted connector, in exchange.
Most snippets of info I find, seem to point to exchange as being the problem, a sort of "greylisting".
However, I'd like to post the custom part of my main.cf, in case anyone has run into this before.
I've been reading through postfix docs, and have checked things like postscreen, ect; that might be acting as a sort of filter or block. So, I don't think my main.cf is wrong, but I did have to add a bit when compared to my older server. So, I may still be missing a line.
I did have to edit out my domain info and subnets,but those shouldn't be the problem, as they are what the current server uses.
Any ideas are welcome.
Thanks, all.
Code:myhostname = smtp.server.com
mydomain = server.com
myorigin = $mydomain
inet_interfaces = all
mynetworks = subnets required hash:/etc/postfix/access
relayhost = [smtp:exchhybrid.server.com]
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
transport_maps = hash:/etc/postfix/transport
smtpd_sender_restrictions = check_sender_access hash:/etc/postfix/access
smtpd_relay_restrictions = defer <-- added to get telnet to even connect.
smtpd_recipient_restrictions = permit_mynetworks
message_size_limit = 251658240
The new server is rhel 8.8, with postfix-3.5.8-4.el8.x86_64.
I am currently working on testing, using telnet to try and send mail to an exchange server.
Telnet connects, I can EHLO and MAIL FROM:, fine.
It's when I do the RCPT TO: and then put in any email address, I get:
450 4.3.2 Recipient address rejected: Try again later
Now, there is no dns record for this server, as once it successfully sends mail, it'll get the old server's hostname and IP. So, my co-worker added the current IP, as an accepted connector, in exchange.
Most snippets of info I find, seem to point to exchange as being the problem, a sort of "greylisting".
However, I'd like to post the custom part of my main.cf, in case anyone has run into this before.
I've been reading through postfix docs, and have checked things like postscreen, ect; that might be acting as a sort of filter or block. So, I don't think my main.cf is wrong, but I did have to add a bit when compared to my older server. So, I may still be missing a line.
I did have to edit out my domain info and subnets,but those shouldn't be the problem, as they are what the current server uses.
Any ideas are welcome.
Thanks, all.
Code:myhostname = smtp.server.com
mydomain = server.com
myorigin = $mydomain
inet_interfaces = all
mynetworks = subnets required hash:/etc/postfix/access
relayhost = [smtp:exchhybrid.server.com]
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
transport_maps = hash:/etc/postfix/transport
smtpd_sender_restrictions = check_sender_access hash:/etc/postfix/access
smtpd_relay_restrictions = defer <-- added to get telnet to even connect.
smtpd_recipient_restrictions = permit_mynetworks
message_size_limit = 251658240