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Google has some options: see the Recommendations section on <a href="https://support.google.com/a/answer/166852" rel="ugc nofollow">https://support.google.com/a/answer/166852</a>. &nbsp;(I haven't tried any of these options, so can't provide any pros and cons for you myself.)
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Google has some options: see the Recommendations section on https://support.google.com/a/answer/166852 [https://support.google.com/a/answer/166852].  (I haven't tried any of these options, so can't provide any pros and cons for you myself.)

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Greetings,<br />
&nbsp; We are a small 3 person dev. team. &nbsp;We run a set of scientific researcher systems that, during a few times in the research cycle, &nbsp;often require sending of hundreds of emails per day (and each email can have 1-7 researcher addresses on it). These are all legitimate, non spam email about subscribers research requests. <br />
&nbsp; All of our clients are on their own domains and subscriptions via Google Apps Business for email usage. &nbsp;We love the reliability.<br />
&nbsp; But, some of our clients are growing now, and we are hitting up against Google Apps sending limits for emails (in 24hr period). &nbsp; <br />
&nbsp; The lists that we are sending to are dynamic and changing, so listservs or groups are not practical.<br />
<br />
Can anyone suggest to us what we should do about this, or if we should be ditching Google Apps Business for sending these client emails?<br />
<br />
Many thanks,<br />
Sbsmithjax
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Greetings,
  We are a small 3 person dev. team.  We run a set of scientific researcher systems that, during a few times in the research cycle,  often require sending of hundreds of emails per day (and each email can have 1-7 researcher addresses on it). These are all legitimate, non spam email about subscribers research requests. 
  All of our clients are on their own domains and subscriptions via Google Apps Business for email usage.  We love the reliability.
  But, some of our clients are growing now, and we are hitting up against Google Apps sending limits for emails (in 24hr period).   
  The lists that we are sending to are dynamic and changing, so listservs or groups are not practical.

Can anyone suggest to us what we should do about this, or if we should be ditching Google Apps Business for sending these client emails?

Many thanks,
Sbsmithjax

Google Apps Business Email limits

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.

Email Software

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

An email client, email reader or more formally mail user agent (MUA) is a computer program in the category of groupware environments used to access and manage a user's email. A web application that provides message management, composition, and reception functions may internally act as an email client; as a whole, it is commonly referred to as webmail. Likewise, email client may be referred to a piece of computer hardware or software whose primary or most visible role is to work as an email client. Email clients can also have other systems, like calendars, notes and contact managers.