Comma in company name results in mail failure: Could not instantiate mail function

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I'm on 7.5.1.

Today I just found a potential bug: whenever a client's company name contains a comma, such as ABC Company, Inc., any mail sent to the client will fail with error "Could not instantiate mail function". I did not test with any other character or other fields. I'm using PHP Mail.

Can others run a test by adding a mock client with a comma in company name and send a test welcome email to it and see if it results in this error?

Thanks.

 

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Update: tried to use SMTP instead of PHP Mail and problem went away.