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thunderbird not using comma on to field

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Hello, I use Thunderbird to send messages to a specific service that requires a very odd send to address. The address starts with an email destination and then has variables separated by a comma. The receiving server will only accept the message with a comma separator not a semicolon. As of the latest update 52.6.0 a comma is no longer accepted, the to field turns red when trying to us a comma.

Does anyone know if this is a new setting or a bug?

If it is a setting can it be turned off? How?

Thanks

Hello, I use Thunderbird to send messages to a specific service that requires a very odd send to address. The address starts with an email destination and then has variables separated by a comma. The receiving server will only accept the message with a comma separator not a semicolon. As of the latest update 52.6.0 a comma is no longer accepted, the to field turns red when trying to us a comma. Does anyone know if this is a new setting or a bug? If it is a setting can it be turned off? How? Thanks

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Commas are used in Thunderbird particularly, and under the bonnet more generally in email, as separators between multiple To: addresses. In Thunderbird, we generally recommend arranging one address per line and so by and large can avoid using them.

If you really do need commas within an address, try wrapping it in inverted commas (quotation marks).

I can't remember if commas are generally accepted as valid in email addresses. I need to look that up. I have met some cases of unlikely looking characters that are valid but not easy to get an email client to use. ISTR, for instance, the colon has a special use for some arcane group feature in email addressing.