I can receive my heartinternet IMAP emails but can't send them, why?

[Pyrosilvathon]

I have an email for business setup with HeartInternet, I use IMAP via OUTLOOK on my PC to use the email, it recieves emails perfectly but doesn't send them.

Im using all the correct details for Outgoing emails, Port 587, STARTTLS etc, am i missing something, is Sky blocking the ports?

[GD1 · Accepted solution]

@Pyrosilvathon  What has your email provider advised as it is them you need to speak to. 

[TimmyBGood]

@Pyrosilvathon 

Heart Internet themselves appear to suggest SMTP Port: 465 (SSL)

[Pyrosilvathon]

Thank you @GD1, contacted my provider, they told be I had Spam blocked myself by using the word test in email titles, and all is now sorted. Thank you