@JaredBusch said in Not seeing traffic for O365 emails at 587, 993 and 995 ports on Firewall.:
@scottalanmiller said in Not seeing traffic for O365 emails at 587, 993 and 995 ports on Firewall.:
@openit said in Not seeing traffic for O365 emails at 587, 993 and 995 ports on Firewall.:
@scottalanmiller said in Not seeing traffic for O365 emails at 587, 993 and 995 ports on Firewall.:
@openit said in Not seeing traffic for O365 emails at 587, 993 and 995 ports on Firewall.:
@scottalanmiller said in Not seeing traffic for O365 emails at 587, 993 and 995 ports on Firewall.:
@openit said in Not seeing traffic for O365 emails at 587, 993 and 995 ports on Firewall.:
Ok, I understand, due to direct connection from Outlook with exchange, no port is being hit on Firewall. So only non-genuine emails going to be recognized at firewall.
Thanks.
Correct. Outlook has basically a private VPN back to the Exchange server over port 443 so no visible traffic of email on your network because there is none. That's better, so ANY SMTP traffic, on any port, is suspect.
Is that also means, if our ISP is blocking our email things due to Spam issue, it's not going to effect our O365 users (while they send emails through outlook client) ?
Outlook doesn't use SMTP or send email, it sends instructions to Exchange, which is totally different. No email protocols are involved.
Okay, so any email ports blocked by our ISP is not going to effect our O365 users.
Correct. You are not sending email in and out of your network, you are only looking at the email system remotely. There are no email protocols, no email traffic and no actual email moving across your network with the tools that you are using.
It has nothing to do with Office365 either. Outlook does not use email protocols for any thing on an exchange server. In house or otherwise.
Right, good point. This is all just general Exchange / Outlook protocol info, not related to a specific hosting service.