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Using the same custom header multiple times (x-mailgun-tags)

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soyeong
soyeong
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Hi, I'm trying to use "x-mailgun-tags" headers two times for my email as Mailgun supports up to 3 tags. However, it seems that only 1 tag out of 2 is registered every time it sends. Does anybody know whether Thunderbird supports using the same headers multiple times? Thank you.

Hi, I'm trying to use "x-mailgun-tags" headers two times for my email as Mailgun supports up to 3 tags. However, it seems that only 1 tag out of 2 is registered every time it sends. Does anybody know whether Thunderbird supports using the same headers multiple times? Thank you.

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Matt
Matt
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Duplicated here https://support.mozilla.org/en-US/questions/1277397