Send Mail from Database via Office 365

I have a doctors office that does health screenings.  They send out possibly a few hundred emails at a time to people that have signed up with a company.   They have lots of mail not getting to people.    They are using a 3rd party that is hosting the database and the mail.   Mostly yahoo, aol and gmail, people never get it.  The host says it is not them, but I believe it has to be them.  Something has gotten blacklisted so the people are not getting emails from the doctors domain.  I want to move them to a better product like office 365.  Has anyone been able to use office 365 via a database and send out email that way?  I am trying to find a solution without putting an in house exchange server in there.   Any ideas?

Generally what happens, is a school for instance will sign up.  Everyone there will go to the website and sign up.  When the doctor goes to the school, beforehand, everyone gets an email saying this is when it is.  This is kicked off thru the database automatically.    That is when people do not get the email.   But also, my domain is hosted thru google.  The lady sent me an email and it did not come through to me, so it isn't just these massive emails.
 
Thanks for the help!
Kevin CaldwellOwner of RUseeingRed Tech SolutionsAsked:
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Boyd (HiTechCoach) Trimmell, Microsoft Access MVPCommented:
Generally what happens, is a school for instance will sign up.  Everyone there will go to the website and sign up.  When the doctor goes to the school, beforehand, everyone gets an email saying this is when it is.  This is kicked off thru the database automatically.    That is when people do not get the email.   But also, my domain is hosted thru google.  The lady sent me an email and it did not come through to me, so it isn't just these massive emails.

Sounds like it may be the recipients mail server's spam software is seeing a lot of emails coming all at once from the same domain and thinks it is spam.  This is a common problem. It could be the volume and rate of sending per hour.

A big issue is the recipient seeing your email as spam.

With the current solution, can you see if there are any bounce backs to see if they are getting rejected?

Have you ask the recipient (in this case the school)  to whitelist the sending email address?

I have developed email marketing solutions for clients.  When trying to use an in-house mail server or a hosted mail server,   common issue is the rate you are sending,

 Most hosted email servers have a max number per hour you can send.  Once you hit the max, emails not longer go out,  have you check with your current host to see how many email an hour can be sent?


About Office 365:
I have developed Access database solutions that send the emails through an Office 365 Exchange mailbox.
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Kevin CaldwellOwner of RUseeingRed Tech SolutionsAuthor Commented:
What is interesting though is that she sent me one email and still did not get it.
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