I followed https://www.unixmen.com/setup-a-local-mail-server-in-centos-7/ to setup my mail server.
Currently,my mail server can neither receive from nor send to an external email account.Postfix and Dovecot are working perfectly,and it seems I can't telnet stg.plus(MX Record to csm.hostat.cloud) but csm.hostat.cloud(A Record to the server) is working.
Postfix main.cf
netstat -plntu
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:110 0.0.0.0:* LISTEN 5081/dovecot
tcp 0 0 0.0.0.0:143 0.0.0.0:* LISTEN 5081/dovecot
tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN 1/systemd
tcp 0 0 0.0.0.0:25110 0.0.0.0:* LISTEN 3150/sshd
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN 5336/master
tcp 0 0 0.0.0.0:993 0.0.0.0:* LISTEN 5081/dovecot
tcp 0 0 0.0.0.0:995 0.0.0.0:* LISTEN 5081/dovecot
tcp6 0 0 :::110 :::* LISTEN 5081/dovecot
tcp6 0 0 :::143 :::* LISTEN 5081/dovecot
tcp6 0 0 :::111 :::* LISTEN 1/systemd
tcp6 0 0 :::80 :::* LISTEN 5207/httpd
tcp6 0 0 :::25110 :::* LISTEN 3150/sshd
tcp6 0 0 :::16823 :::* LISTEN 2971/v2ray
tcp6 0 0 ::1:25 :::* LISTEN 5336/master
tcp6 0 0 :::993 :::* LISTEN 5081/dovecot
tcp6 0 0 :::995 :::* LISTEN 5081/dovecot
udp 0 0 0.0.0.0:111 0.0.0.0:* 1/systemd
udp 0 0 127.0.0.1:323 0.0.0.0:* 2109/chronyd
udp 0 0 0.0.0.0:879 0.0.0.0:* 2012/rpcbind
udp6 0 0 :::111 :::* 1/systemd
udp6 0 0 ::1:323 :::* 2109/chronyd
udp6 0 0 :::879 :::* 2012/rpcbind
iptables -S
-P INPUT ACCEPT
-P FORWARD ACCEPT
-P OUTPUT ACCEPT
iptables -L
Chain INPUT (policy ACCEPT)
target prot opt source destination
Chain FORWARD (policy ACCEPT)
target prot opt source destination
Chain OUTPUT (policy ACCEPT)
target prot opt source destination
iptables-save
# Generated by iptables-save v1.4.21 on Sat Aug 17 00:14:33 2024
*filter
:INPUT ACCEPT [105:5976]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [82:5528]
COMMIT
# Completed on Sat Aug 17 00:14:33 2024
This question actually mentioned the same error but different from mine.https://serverfault.com/questions/883344/temporary-authentication-failure-454-4-7-1-email-relay-access-denied The writer of https://www.unixmen.com/setup-a-local-mail-server-in-centos-7/ didn't mention the SMTP and IMAP server settings.Please comment if you have any solutions.Appreciate that. stg.plus hostat.cloud
