Hi. I had a problem before with mail going into spam, but i fixed this with headers. Sometimes now however, specifically if sending to hotmail, some of the links i send in an email are not underlined, or hyperlinked. Is there anyway i can force it to be a hyperlink?
If you’re sending as plain text, there’s no guarantee that urls will be displayed as links - that’s up to the client to decide. The only way to enforce that urls are displayed as links is to send HTML mail, unfortunately.
Most mail libraries support the addition of a plain text alternative if the client doesn’t support HTML.
Best of both worlds then. 
plain text. Trying to avoid html because not all clients allow for this.
Are you sending the mails as plain text or as html?