Trying from a computer that has a different ISP provider may help.
Setting your DNS server setting to OpenDNS may help.
An email client usses dns servrs to translate @comcast.net to a valid email server IP address.
Google "smtp site:forums.filemaker.com" searches only this site
Sustom Google Serch I created is here searches four Filemaker Forums.
The Campus Productivity Kit that Filemaker released in 2007 is still available at CNet downloads.
If the runtime is opened in Filemaker, it makes PDFs and sends Emails. A useful template for looking at design and structure.
The Computer Guy Seattle
Thanks for that.
I will look through some of the posts but... if it was a dns problem wouldnt it just not work at all? as if i persist and keep pressing email invoice button a after everytime i get a error not sent i eventually works.
DNS servers are computers and can exhibit sporadic problems. It depends on the number of requests they are processing.
The VERY first thing your email client does, is access a DNS server..
Using a different DNS server is a VERY quick test.
Read some of these links Google "email problem dns server"
High level DNS servers include 184.108.40.206 and 220.127.116.11 (Level 7 servers, I believe, maybe Google)
You do not list your Computer, OS and version, and ISP provider..
The Computer Guy, Seattle