AntiSpam explanation

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kyssling
kyssling Posts: 107 image  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: 809 image  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: 809 image  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 image  Ally Member
    First Comment First Answer Friend Collector Sixth Anniversary
    Can someone please answer? Thanks very much !
    Vaclav
  • Zyxel_James
    Zyxel_James Posts: 809 image  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 image  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: 809 image  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 image  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: 809 image  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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