Your ISP or web host's SMTP server.
These are often poorly run and configured wrong, have unacceptable downtime, and come with untold daily restrictions on the number of emails you can send.
Such servers often have nobody looking after their reputation - blacklisting is a near certainty.
Dedicated Email server from Rackspace etc.
Purchasing a dedicated server for sending email from a reliable company such as Rackspace will run you around $750 per month.
Additionally, you will likely need to hire in-house IT personnel to make sure the server is correctly setup and monitored.
... And then there's Flyinfotech.
Use Flyinfotech and rest easy in knowing that your emails will always get to their destinations, no matter what.
You can focus on what you do best, and leave all the email handling to us. We're pros, and we can handle any issues related to outgoing email.<
Contact us to inquire about joining any of the above plans