Why is the return type of TransportInterface::send() nullable?

[cheyder]

symfony/mailer

Does anyone know, why the TransportInterface::send() returns ?SentMessage? I couldn't find any implementation which would return null. If this could be strictly SentMessage it would save us some checks afterwards. Otherwise, if it is supposed to be nullable, does someone know what it is supposed to mean? Was the sending succesful, or occured any error?

[MatTheCat]

Before #36467 send would return null if no recipient were set but, it now seems this can indeed no longer happen. You can try opening a PR but I’m not sure it’ll be considered worth it.

[cheyder]

Thanks! That's what I was looking for. I'll prepare a pr within the next days. Let's see if it'll considered worth it ;)