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Max recipients in single email - Outlook 2016

I need to send an email to 12,000 recipients.  What is the max number of recipients in a single email?
Hi there

The limit is 500 recipients for 365

I would advise splitting into groups of 500
Or seeing if you can create mailing lists of groups of 500 then create a mailing list to include the mailing list, but this might fail as I have never used this.

You might want to look at s third party mail application such as mail chimp

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Depending on your account, it's way less than that - generally around 100, but can be higher in Exchange server. It would be better to use mail merge.

Note that it will take a long time to send - using a 3rd party mailing server such as constant contact would be better. Sendgrid and amazon SES SMTP service is also an option - if you use your own SMTP server, it could get on a blacklist.
--
Diane Poremsky
M365 MVP, specializing in Outlook, Exchange, and Microsoft 365 apps.

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Thanks.  I'm using the desktop version Outlook 2016.  I'm surprised of the low limit in 2016 because I know i've sent upwards of 100 recipients in Outlook 2013.

Note:  I'm using 2016 in a corporate environment (i.e. I'm assuming exchange).

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Thanks Diane!

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>>
I'm surprised of the low limit in 2016 because I know i've sent upwards of 100 recipients in Outlook 2013.
>>
They have the same code base. :) The limits haven't changed in many, many years.

In an Exchange account, you can have higher limits if you are using a distribution list in the global address list.

Sending to internet addresses is limited to around 100, even if you use a Contact group (because it expands before its sent).
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Diane Poremsky
M365 MVP, specializing in Outlook, Exchange, and Microsoft 365 apps.

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Hmm.  As recently as August, I sent an email to approximately 150 recipients by copying a list of recipients into the BCC field.  This was using 2010 or 2013 before I was upgraded to 2016.  I guess I will need to separate the 12,000 recipients into batches of 100 or 500.

Thanks again for the reply.

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>> I sent an email to approximately 150 recipients by copying a list of recipients into the BCC field.
That should work in 2016 too - the size limit (for internet addresses) is based in part on length of addresses, not a specific # of addresses.

If you are on Office 365, there are per user sending limits. You may need to send over a two day period.
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Diane Poremsky
M365 MVP, specializing in Outlook, Exchange, and Microsoft 365 apps.

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Hi there,

If you are in a corporate environment you may want to speak to your IT department as they may have changed this limit

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Last updated January 17, 2023 Views 14,807 Applies to: