smtps for --ssl-reqd

[kunthar]

curl --ssl-reqd smtp://mail.example.com --mail-from myself@example.com \
     --mail-rcpt receiver@example.com --upload-file email.txt \
     --user 'user@your-account.com:your-account-password'

should be

curl --ssl-reqd smtps://mail.example.com --mail-from myself@example.com \
     --mail-rcpt receiver@example.com --upload-file email.txt \
     --user 'user@your-account.com:your-account-password'

[dfandrich]

No, it is correct as-is. It's explained just before this that --ssl-reqd is used for "upgrading from clear-text to secure transfers", meaning that the transfer needs to start with clear text, therefore smtp:. smtps: means implicit TLS, so the transfer is encrypted from the start and there is no upgrading needed.

[kunthar]

No, it is correct as-is. It's explained just before this that --ssl-reqd is used for "upgrading from clear-text to secure transfers", meaning that the transfer needs to start with clear text, therefore smtp:. smtps: means implicit TLS, so the transfer is encrypted from the start and there is no upgrading needed.

sorry i've missed the port part. maybe it is better to add this one as an example too.

time curl --ssl-reqd smtp://mail-eu.smtp2go.com:465 --mail-from noreply@example.com      --mail-rcpt your@user.com --upload-file mail-test.txt      --user 'user:pass'
 % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:--  0:02:00 --:--:--     0
curl: (28) server response timeout

but if

curl --ssl-reqd smtps://mail.example.com:465 --mail-from myself@example.com \
     --mail-rcpt receiver@example.com --upload-file email.txt \
     --user 'user@your-account.com:your-account-password'

it is ok.

[dfandrich]

Port 465 is the smtps port, so choosing non-TLS smtp on that port (e.g. smtp://mail-eu.smtp2go.com:465) makes no sense. And using --ssl-reqd on an smtps: URL is redundant since smtps: already requires TLS.