AntiSpam explanation

kyssling
kyssling Posts: 107  Ally Member
First Comment First Answer Friend Collector Sixth Anniversary
in Security
Hello,
can someone please explain me if AntiSpam works, if we have an external mail server, exapmle : mail.company.com and we send emails using smtp.company.com and receive pop3/imap.company.com ...

I can't understand how it can work if I don't enter mail server addresses anywhere on Zyxel ... Zyxel selects what it needs from the packets ? ...

Thank you ! Vaclav

Best Answers

  • Zyxel_James
    Zyxel_James Posts: 718  Zyxel Employee
    Zyxel Certified Network Administrator - Security Zyxel Certified Network Administrator - Nebula Zyxel Certified Sales Associate 100 Answers
    Answer ✓
    Hello @kyssling,
    Zyxel AntiSpam filters SMTP and POP3 packets when clients send email to external mail server and clients receive email from external mail server.
    Thank you.

    James.
  • Zyxel_James
    Zyxel_James Posts: 718  Zyxel Employee
    Zyxel Certified Network Administrator - Security Zyxel Certified Network Administrator - Nebula Zyxel Certified Sales Associate 100 Answers
    Answer ✓
    Zyxel anti-spam feature only checks STMP (TCP port 25) and POP3 (TCP port 110) e-mails, does not check e-mails that use other protocols(such as IMAP) or other port numbers.
    Thank you.

    James.

All Replies

  • kyssling
    kyssling Posts: 107  Ally Member
    First Comment First Answer Friend Collector Sixth Anniversary
    Can someone please answer? Thanks very much !
    Vaclav
  • Zyxel_James
    Zyxel_James Posts: 718  Zyxel Employee
    Zyxel Certified Network Administrator - Security Zyxel Certified Network Administrator - Nebula Zyxel Certified Sales Associate 100 Answers
    Answer ✓
    Hello @kyssling,
    Zyxel AntiSpam filters SMTP and POP3 packets when clients send email to external mail server and clients receive email from external mail server.
    Thank you.

    James.
  • kyssling
    kyssling Posts: 107  Ally Member
    First Comment First Answer Friend Collector Sixth Anniversary
    One more little question :
    Does AntiSpam work even if the connection between the PC and the mailserver is encrypted?
  • Zyxel_James
    Zyxel_James Posts: 718  Zyxel Employee
    Zyxel Certified Network Administrator - Security Zyxel Certified Network Administrator - Nebula Zyxel Certified Sales Associate 100 Answers
    Hello @kyssling,
    Since SMTP and POP3 are unencrypted transmission in the process of connection with the server, Zyxel AntiSpam could detect/filter the packets. That is Zyxel AntiSpam does not support detect/filter encrypted transmission such as TLS packets.
    Thank you.

    James.
  • kyssling
    kyssling Posts: 107  Ally Member
    First Comment First Answer Friend Collector Sixth Anniversary
    Very thanks for answer ! So if the transmission is unencrypted, does it work under IMAP too ?
  • Zyxel_James
    Zyxel_James Posts: 718  Zyxel Employee
    Zyxel Certified Network Administrator - Security Zyxel Certified Network Administrator - Nebula Zyxel Certified Sales Associate 100 Answers
    Answer ✓
    Zyxel anti-spam feature only checks STMP (TCP port 25) and POP3 (TCP port 110) e-mails, does not check e-mails that use other protocols(such as IMAP) or other port numbers.
    Thank you.

    James.

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