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Office 365 SMTP Relay Guide

This document compares different methods for sending email through Office 365, including direct send, Exchange Online relay, and Exchange Online Protection relay. Direct send allows sending to recipients in the same domain without going through the internet, but requires port 25 and optional TLS. Exchange Online relay and Exchange Online Protection relay both allow sending through the internet via Office 365, but have additional configuration and licensing requirements compared to direct send.

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1K views35 pages

Office 365 SMTP Relay Guide

This document compares different methods for sending email through Office 365, including direct send, Exchange Online relay, and Exchange Online Protection relay. Direct send allows sending to recipients in the same domain without going through the internet, but requires port 25 and optional TLS. Exchange Online relay and Exchange Online Protection relay both allow sending through the internet via Office 365, but have additional configuration and licensing requirements compared to direct send.

Uploaded by

DIPANJALI
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PPTX, PDF, TXT or read online on Scribd
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Relay Send to Relay to Configuration Requires Bypasses Throttling Licensing

Method rcpts in Internet Requirements Authentication Anti-spam Limits Requirements


domain via O365
Direct Send Yes No (Direct Port 25; TLS No No – None Email sender
delivery optional suspicious licensing not
only) emails may be required
filtered;
custom SPF
record
recommended
Exchange Yes Yes Port 587 or 25; Yes (If device Yes – for mails 10,000 Can use a
Online Relay TLS required; does not destined to recipients standard or
dynamic IPs support this your Office 365 per day shared mailbox
allowed option, you can mailboxes
use on-premises
IIS SMTP relay)

Exchange Yes Yes Port 25; TLS No No – 10,000 Requires


Online optional; one suspicious (outbound) Exchange Online
Protection or more static emails may be recipients Protection
Relay IP Addresses filtered; per hour licenses for each
are required custom SPF sender; Office
record 365 mailboxes
recommended have this license
http://community.office365.com/en-us/wikis/exchange/how-to-setup-an-smtp-relay-in-
office-365.aspx

http://support.microsoft.com/kb/2799338

http://support.microsoft.com/kb/2600912

http://technet.microsoft.com/en-us/library/jj723133(v=exchg.150).aspx

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