Mass Email
I have two different email clients I use Cox Business and the other is gmail business account. I have never been able to send out mass emails from the gmail account and mass only being about 175 users. Until this week I could send out mass email from the cox account. I get an error message from gmail that says Sending of the message failed. Your message has too many recipients. ToomanyRecipientserror 5614622812f47-3e661190b86sm3130092b6e.7 - gsmtp. The other error message I am getting from cox says. Sending of the message failed. Recipient temporarily rejected - OXSUS003_403 -https://postmaster-oxsus.vadesecure.com/outbound_error_codes/#_405. However I can send a mass email to the same recipients from my personal email from cox using thunderbird and have no issues. I would love any suggestions you may have. I would really love to solely use my gmail account and move away from the cox business account if we can get this working.
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I tried the Mail Merge it didn't work. I found out that I can use the mail merge when logged into the gmail account on the web and then send the mass text out. But when I tried to send it through Thunderbird it comes back saying too many recipients.
Yes, the error is being reported by Thunderbird but it is originating with your mail provider.
In the image Gmail is reporting that they are not allowing you to send mail to that many recipients at the same time. Have you considered reading their terms of use and limits imposed? Google limit you to 100 recipients. See https://support.google.com/a/answer/166852?hl=en&ref_topic=28609&sjid=10217884553058824860-AP#zippy=%2Cfree-trial-account-limits Cox, well they are a US based ISP that like many in that country has an identity crisis. They have "outsourced" their consumer email to Yahoo. So you will be dealing with their email limits and requirements.
email and yahoo do not publish what these are. https://help.yahoo.com/kb/SLN3353.html
Cox Business. Is that also "outsourced". I have no idea. You might have to ask them. This discussion suggests the limit may be around 150. https://www.cox.com/business/support/mass-mailing-policies-and-requests.html
The Thunderbird development team build a mail client,Thunderbird, but they do not use it for mass mailings. They instead have chosen the services of mailchimp https://mailchimp.com I have no affiliation or am I promoting them as a solution here. I mention them because they are used by the development company instead of Thunderbird because of the inherent issues with blacklists and spam filtering that surround large mailings these days. Professional mailing is what needs to be used for more than a few. SmartReach, another mass mailing provider suggests limiting the emails from a single address to 50 per day. But I will let you read their well thought out position here https://smartreach.io/blog/email-sending-limits/
What you need to do immediately is reduce the size of your mailing list, perhaps divide it into three smaller ones.
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