blocking port 25 cause mail server cannot receive mail

Published: 9/02/2019
blocking port 25 cause mail server cannot receive mail
Source: SERVERFAULT.COM

I use TLS for my postfix and dovecot,and I ready test centos 7 mail server by various tools,result as below: Priority: 5 Connection established: yes TLS: yes SSL: yes Cipher: TLSv1/SSLv3, Cipher is ECDHE-RSA-AES256-GCM-SHA384 Uses secure cipher: yes Then I block port 25 in iptables ,but I cannot receive mail any more. As I ready use TLS,which means I only use 587 or 465 ,why blocking port 25 cause

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