Sending email through 3rd party SMTP

OK Ive read the KB article re PHP mailing, however Im wondering if the restrictions on sending PHP email apply if using a 3rd party SMTP server?

Specifically im trying to use vtiger which has the option to enter in a 3rd party SMTP server. I’ve checked and rechecked the settings are correct and still nothing, it simply doesnt connect / send, rather tells me it couldnt send the email.

Any clarification on this would be appreciated.

Sending restrictions may apply when using third party SMTP servers. However, that would be the limits set by the people who operate that SMTP server, not InfinityFree.

Which SMTP server are you trying to use to send email? And where are you trying to send it to?