Am 08.07.2020 um 11:53 schrieb Kishore Potnuru:

Hi All,

I request your help on this.

I have 2 dovecot test servers (IMAP protocol) installed with the following configuration.

[root@devap01 ~]# cat /etc/redhat-* Red Hat Enterprise Linux Server release 6.10 (Santiago)

[root@devap01 ~]# dovecot --version 2.0.9

[root@devap01 ~]# postconf | grep mail_version mail_version = 2.6.6

Kishore,

please don't address me personally. This is a mailing list and I don't offer / sell consulting.

Let me comment only on the versions you provide. Please be aware that RHEL 6 will get EOL by end of November this year. So your strategy better comprises a migration to RHEL 7 or RHEL 8.

Along that steps to a current RHEL major release you will profit from newer Dovecot and Postfix releases. Running RHEL 8 you would even get pretty current releases, still supported by the upstream projects.

Alexander