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We use junkemailfilter.com as our outbound spam filter and smarthost. Their cost is reasonable (which is to say their cost is significantly less than the cost of dealing with blacklisted ip's). <br />
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Disclaimer - I am not associated in any way with junkemailfilter.com, except as a satisfied customer. If I have broken any experts-exchange rules by recommending a commercial service, then I apologize and this post should be deleted.
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We use junkemailfilter.com as our outbound spam filter and smarthost. Their cost is reasonable (which is to say their cost is significantly less than the cost of dealing with blacklisted ip's).

Disclaimer - I am not associated in any way with junkemailfilter.com, except as a satisfied customer. If I have broken any experts-exchange rules by recommending a commercial service, then I apologize and this post should be deleted.

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We currently send out about 70k-100k quotes monthly via email.<br />
<br />
We would like to setup a smart host that will keep us out of spam boxes. These are legitimate emails. Not spam.<br />
<br />
What smarthost or SMTP relay company is everyone using?
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We currently send out about 70k-100k quotes monthly via email.

We would like to setup a smart host that will keep us out of spam boxes. These are legitimate emails. Not spam.

What smarthost or SMTP relay company is everyone using?

SMTP Relay

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.

Email Servers

Various techniques are used to prevent email spam (unsolicited bulk email). No technique is a complete solution to the spam problem, and each has trade-offs between incorrectly rejecting legitimate email (false positives) vs. not rejecting all spam (false negatives) - and the associated costs in time and effort. Anti-spam techniques can be broken into four broad categories: those that require actions by individuals, those that can be automated by email administrators, those that can be automated by email senders and those employed by researchers and law enforcement officials.

AntiSpam

An email client, email reader or more formally mail user agent (MUA) is a computer program used to access and manage a user's email. A web application that provides message management, composition, and reception functions is sometimes also considered an email client, but more commonly referred to as webmail.