iPhone email limits

How many users can I send an email to on the iPhone. I have a user that said he could only add 27 email addresses to one new email he was about to send this morning.
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Eoin OSullivanConsultantCommented:
The Mail Service used will determine the limits to recipients .. for example iCloud allows only 100 recipients per email

27 recipients seems a strange, arbitrary number.  Many servers have a default limit of 100 which would be more normal

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The sending limits for an Outlook.com account are:

Sending limits
Account type      Recipients per message      Messages per day
New account      10 – 50                                      10 – 50
Free user      100                                               300
Paid user      100                                               >300

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IT_FanaticAuthor Commented:
They are sending emails from the office using their office 365 account
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The default limit of 100 would be normal... why only 27?
It can be a data cap limit of the total emails content data that peaks at 27 emails ...
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IT_FanaticAuthor Commented:
Thank you
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