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External exchange port 25 once all mailboxes are moved..
Hi, We have moved all our mailboxes to Office 365. Our MX records point to Office 365. Is there any reason to have the external port 25 open on our in house Hybrid server? Thanks
- Ok, if you’re not using on premises mail servers (hybrid) you’re safe to block it :)
Cheers / adam
Also if you use any other ways for devices in your environment to send mail please check this! Direct send and smtp relay could utilize port 25 as well!
Except from this I think you’re safe
Please have a look at the link below regarding the ways to setup smtp with devices, and do a checkup!!
https://support.office.com/en-us/article/how-to-set-up-a-multifunction-device-or-application-to-send-email-using-office-365-69f58e99-c550-4274-ad18-c805d654b4c4
Except from this I think you’re safe
Please have a look at the link below regarding the ways to setup smtp with devices, and do a checkup!!
https://support.office.com/en-us/article/how-to-set-up-a-multifunction-device-or-application-to-send-email-using-office-365-69f58e99-c550-4274-ad18-c805d654b4c4