Email Notifications SMTP Not Working

So I am trying to setup email notifications on one of my OS3 AC devices with fw 2.2.1(3) and I am seeing errors reported from my mail server.

[SMTP 015513 29-10-25 09:57:44] Received SMTP connection on 192.168.3.120 (25) from 192.168.3.4 (56350)
[SMTP 015513 29-10-25 09:57:44] Number of current SMTP connections: 2
[SMTP 015513 29-10-25 09:57:44] 220 mvhoa.org ArGoSoft Mail Server SMTP Module v.2.0.1.0 at Wed, 29 Oct 2025 16:57:44 GMT
[SMTP 015513 29-10-25 09:57:44] º ¶ Z̨̩À+À/À,À0À¬À­À®À¯À#À’À$À(À ÀÀ
[SMTP 015513 29-10-25 09:57:44] Incrementing the counter for IP address 192.168.3.4 in lockout manager: Current=1, Allowed=3.
[SMTP 015513 29-10-25 09:57:44] 502 Unknown command
[SMTP 015513 29-10-25 09:57:44] ÀÀ-À1À.À2À%À)À&À*ÀÀÀÀ œ ÀœÀÀ À¡ < = / 5ÀÀÀÀ
[SMTP 015514 29-10-25 09:57:44] Received SMTP connection on 192.168.3.120 (25) from 192.168.3.4 (64004)
[SMTP 015514 29-10-25 09:57:44] Number of current SMTP connections: 3
[SMTP 015513 29-10-25 09:57:44] Incrementing the counter for IP address 192.168.3.4 in lockout manager: Current=2, Allowed=3.
[SMTP 015513 29-10-25 09:57:44] Error: One or more errors occurred. – Unable to write data to the transport connection: An established connection was aborted by the software in your host machine.
[SMTP 015513 29-10-25 09:57:44] SMTP connection 015513 on 192.168.3.120 (25) with 192.168.3.4 (56350) ended
[SMTP 015513 29-10-25 09:57:44] Number of current SMTP connections: 2

Any thoughts?

Thanks,