Recently (2 weeks ago) my incoming emails are going into my spam folder.  Had no issues for nearly 3 months then it started all of the sudden.  I did add the SPF TXT with my DNS manager as recommended on other post but in no avail.  Senders under my white listed (contacts) are also going to SPAM.  Any ideas on what else I can do?

Here's the SPF TXT added to my DNS manager

; TXT Records
@ 1800 IN TXT "v=spf1 mx include:zoho.com ~all"