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451 Error code | Knowledge Base ▸ MaxBulk Mailer Pro

451 Error code

Knowledge Base ▸ MaxBulk Mailer Pro

Compatible with MS Windows Compatible with MacOS

451 Error code

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Question: Hello, when I try to send bulk mails to recipients, after some time it shows me the 451 error code and I want to know what is wrong. I am using namecheap VPS and hostinger as an SMTP server and I have everything put correctly, I tried conacting the support but they could not help me.

Answer: SMTP error 451 occurs when a user sends too many emails, exceeding the email server's sending limits. These limits are set as daily or hourly limits to prevent abusive behavior. The server will not allow the user to send more emails when exceeding the limit. More information here: Sending a message through a server with a daily or an hourly delivery limit.

The solution is to lower the delivery rate. You can do that from the MaxBulk Mailer settings panel. In the example below, we set MaxBulk Mailer to send 400 emails per hour, groups of 25 emails sent every 3:45 minutes.

451 Error code




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MaxBulk Mailer is a full-featured and easy-to-use bulk mailer and mail-merge software for macOS and Windows that allows you to send out customized press releases, prices lists, newsletters and any kind of text or HTML documents to your customers or contacts.

MaxBulk Mailer is fast, fully customizable and very easy to use. MaxBulk Mailer handles plain text, HTML and rich text documents and gives full support for attachments. With MaxBulk Mailer you will create, manage and send your own powerful, personalized marketing message to your customers and potential customers.

Thanks to its advanced mail-merge and conditional functions you can send highly customized messages and get the best results of your campaigns. You also have support for international characters, a straightforward account manager with support for all type of authentication schemes including SSL, a complete and versatile list manager, support for importation from a wide range of sources including from remote mySQL and postgreSQL databases.

MaxBulk Mailer is a software tool that you purchase once, no need to pay on a per-email basis to submission services!

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