Forum Discussion
vijayabv123
Microsoft
MicrosoftSMTP relay without on-prem Exchange server
Hi Exchange Experts,
One of my Customer has following Requirement:
They have already migrated all their user mailboxes to Exchange Online.
They still have 2 Exchange on prem servers functioning as SMTP relay for their applications and printers.
They want to decommission the 2 Exch servers and directly use Exchange online
(yourdomain-com.mail.protection.outlook.com) as SMTP relay.
Their applications and printers do not have a public ip address.
They don't want to use any on-prem mail relay servers.
They don't want to use azure Communication Services.
Their devices and applications do not support TLS 1.3 or TLS 1.2
What would be the best solution ?
Thanks and Best Regards,
Vijay.
4 Replies
vijayabv123VasilMichev
Thank you for your prompt help.
Customer wants to send external SMTP mail as well.
So I am planning to suggest them 3rd party SMTP relay services like,- SMTP2GO
- SocketLabs
- Mailgun
- SendGrid (with custom SMTP relay setup)
- Postmark
What would you suggest ?
you can use sendgrid for this.
HI
we have deployed sendgrid with both exchange on-prem server and without exchange server.
using sendgrid you can directly route emails from application to sendgrid to your recepients.
but please do a feasibility study before implementation because there are few cons with sendgrid. like dashboard,reporting etc.
BR
The available options are detailed here: How to set up a multifunction device or application to send email using Microsoft 365 or Office 365 | Microsoft Learn
Due to the TLS requirements, it seems your only option will be to use direct send, which in turn is limited to internal recipients only. While having a static (and public) IP is not a hard requirement for this scenario, you need to configure the SPF record to account for it.
