wolfssl support

[laoshaw]

can mailsend support wolfssl? it will be nice if wolfssl is supported.

[muquit]

I can. Any reason not to use mailsend-go?

[laoshaw]

mailsend might be the best alternative for ssmtp(obsoleted) on embedded devices(with just a few MBs storage in total), msmtp is another option but it uses gnutls. mailsend-go is too large in size there. Thanks!