Error sending e-mail. Mailbox unavailable. The server response was: 5.7.1 Message rejected as spam by Content Filtering.

Hi! i have strange situation, and see lot's of this errors. Some of this mails are from contact form, to my mailbox… and don't know why, it's not sended?


Error:

System.Net.Mail.SmtpException: Mailbox unavailable. The server response was: 5.7.1 Message rejected as spam by Content Filtering.
   at System.Net.Mail.DataStopCommand.CheckResponse(SmtpStatusCode statusCode, String serverResponse)
   at System.Net.Mail.DataStopCommand.Send(SmtpConnection conn)
   at System.Net.Mail.SmtpConnection.OnClose(Object sender, EventArgs args)
   at System.Net.ClosableStream.Close()
   at System.Net.Mail.MailWriter.Close()
   at System.Net.Mail.SmtpClient.Send(MailMessage message)
   at Nop.Services.Messages.EmailSender.SendEmail(EmailAccount emailAccount, String subject, String body, String fromAddress, String fromName, String toAddress, String toName, String replyTo, String replyToName, IEnumerable`1 bcc, IEnumerable`1 cc, String attachmentFilePath, String attachmentFileName, Int32 attachedDownloadId, IDictionary`2 headers) in C:\XXXX\nop-4.10\src\Libraries\Nop.Services\Messages\EmailSender.cs:line 153
   at Nop.Plugin.Misc.SendInBlue.Services.SendInBlueEmailSender.SendEmail(EmailAccount emailAccount, String subject, String body, String fromAddress, String fromName, String toAddress, String toName, String replyTo, String replyToName, IEnumerable`1 bcc, IEnumerable`1 cc, String attachmentFilePath, String attachmentFileName, Int32 attachedDownloadId, IDictionary`2 headers)
   at Nop.Services.Messages.QueuedMessagesSendTask.Execute() in C:\XXXX\src\Libraries\Nop.Services\Messages\QueuedMessagesSendTask.cs:line 69

Any idea how to fix it?

Hi! any ideas what is it? I see 90% of not sended messages is "activation mail to gmail"?

Can someone explain me "who" reject this message? "nop content filtering" (prevention?) or maybe gmail? Maybe someone have similar problem?

If i change this message template this will be solved? or maybe gmail have us on "spam list"?

Normal messages from our mail server aren't rejected... but this one mail template yes? Why? any suggestion?

What mail server are you using?  (Exchange?)

New York wrote:



Hi, yes! I solved this (i hope so).
I think this is feature in Nopcommerce (can someone confirm?).

I change topics and my messages start sending (it's too early to have 100% right, but mails which i changed and tested stop generate this error).

So if you see this error in you logs, change topic and message body and make them "less looks like a "spam".

Glad you sorted the issue! Sometimes content filtering will flag an email as spam if there is too little text in the body or there are keywords that are flagged as spam, such as the topic that you mentioned.

Yeap, in "contact form" we have only "bodymessage token". And after we add there few more details (like name / email etc). It's start works.


Also "emoticon" in title is to remove ;]