Sending mails with large attachments.

Question

Sending mails with large attachments.

asked Oct 16, 2013 by mercell (160 points)
edited Oct 16, 2013

We have had some problems sending mails with rather large attachments. I don't know the limit but we have tried with both 50 and 100 MB files and had the problem.

We downloaded a trial version of the newest version to see if this had helped because then we would of course just bought that version. Unfortunately this haven't helped.

The scenario is as follows:

We create the mail with attachment and send the mail. After a while we get an error and our log shows the following

2013-10-16 06:28:31:    MX lookup 'mercell.com' on DNS server 'x.x.x.x'
2013-10-16 06:28:31:    (10) post.mercell.com
2013-10-16 06:28:31:    Connecting to MX post.mercell.com (10)
2013-10-16 06:28:31:    220 EXCHSRV.mercell.com Microsoft ESMTP MAIL Service ready at Wed, 16 Oct 2013 08:28:31 +0200
2013-10-16 06:28:31:    EHLO post.mercell.com
2013-10-16 06:28:31:    250-EXCHSRV.mercell.com Hello [x.x.x.x]
2013-10-16 06:28:31:    250-SIZE 209715200
2013-10-16 06:28:31:    250-PIPELINING
2013-10-16 06:28:31:    250-DSN
2013-10-16 06:28:31:    250-ENHANCEDSTATUSCODES
2013-10-16 06:28:31:    250-STARTTLS
2013-10-16 06:28:31:    250-X-ANONYMOUSTLS
2013-10-16 06:28:31:    250-AUTH NTLM
2013-10-16 06:28:31:    250-X-EXPS GSSAPI NTLM
2013-10-16 06:28:31:    250-8BITMIME
2013-10-16 06:28:31:    250-BINARYMIME
2013-10-16 06:28:31:    250-CHUNKING
2013-10-16 06:28:31:    250 XRDST
2013-10-16 06:28:31:    Connected to MX post.mercell.com
2013-10-16 06:28:33:    MAIL FROM:<xxxx@mercell.com> SIZE=143491150
2013-10-16 06:28:33:    250 2.1.0 Sender OK
2013-10-16 06:28:33:    RCPT TO:<xxxx@mercell.com> NOTIFY=FAILURE
2013-10-16 06:28:33:    250 2.1.5 Recipient OK
2013-10-16 06:28:33:    BDAT 98304
2013-10-16 06:28:33:    BDAT 98304
2013-10-16 06:28:33:    BDAT 98304
2013-10-16 06:28:33:    BDAT 98304
2013-10-16 06:28:33:    BDAT 98304
2013-10-16 06:28:33:    BDAT 98304
2013-10-16 06:28:33:    BDAT 98304
2013-10-16 06:28:33:    BDAT 98304
2013-10-16 06:28:33:    BDAT 98304
2013-10-16 06:28:33:    BDAT 98304
2013-10-16 06:28:33:    BDAT 98304
2013-10-16 06:28:33:    BDAT 98304
2013-10-16 06:28:33:    BDAT 98304
2013-10-16 06:28:38:    250 2.6.0 CHUNK received OK, 98304 octets
2013-10-16 06:28:38:    BDAT 98304
2013-10-16 06:28:38:    BDAT 98304
2013-10-16 06:28:38:    BDAT 98304
2013-10-16 06:28:38:    BDAT 98304
2013-10-16 06:28:38:    BDAT 98304
2013-10-16 06:28:38:    BDAT 98304
2013-10-16 06:28:38:    BDAT 98304
2013-10-16 06:28:38:    BDAT 98304
2013-10-16 06:28:38:    BDAT 98304
2013-10-16 06:28:38:    BDAT 98304
2013-10-16 06:28:38:    BDAT 98304
2013-10-16 06:29:28:    250 2.6.0 CHUNK received OK, 98304 octets
2013-10-16 06:29:28:    BDAT 98304
2013-10-16 06:29:28:    250 2.6.0 CHUNK received OK, 98304 octets
2013-10-16 06:29:28:    BDAT 98304
2013-10-16 06:29:28:    250 2.6.0 CHUNK received OK, 98304 octets
2013-10-16 06:29:28:    BDAT 98304
2013-10-16 06:29:28:    250 2.6.0 CHUNK received OK, 98304 octets
2013-10-16 06:29:28:    BDAT 98304
2013-10-16 06:29:28:    250 2.6.0 CHUNK received OK, 98304 octets
2013-10-16 06:29:28:    BDAT 98304
2013-10-16 06:29:28:    250 2.6.0 CHUNK received OK, 98304 octets
2013-10-16 06:29:28:    BDAT 98304
2013-10-16 06:29:28:    250 2.6.0 CHUNK received OK, 98304 octets
2013-10-16 06:29:28:    BDAT 98304
2013-10-16 06:29:28:    250 2.6.0 CHUNK received OK, 98304 octets
2013-10-16 06:29:28:    BDAT 98304
2013-10-16 06:29:28:    250 2.6.0 CHUNK received OK, 98304 octets
2013-10-16 06:29:28:    BDAT 98304
2013-10-16 06:29:28:    250 2.6.0 CHUNK received OK, 98304 octets
2013-10-16 06:29:28:    BDAT 98304
2013-10-16 06:30:23:    250 2.6.0 CHUNK received OK, 98304 octets
2013-10-16 06:30:23:    BDAT 98304
2013-10-16 06:30:23:    250 2.6.0 CHUNK received OK, 98304 octets
2013-10-16 06:30:23:    BDAT 98304
2013-10-16 06:30:23:    250 2.6.0 CHUNK received OK, 98304 octets
2013-10-16 06:30:23:    BDAT 98304
2013-10-16 06:30:23:    250 2.6.0 CHUNK received OK, 98304 octets
2013-10-16 06:30:23:    BDAT 98304
2013-10-16 06:30:23:    250 2.6.0 CHUNK received OK, 98304 octets
2013-10-16 06:30:23:    BDAT 98304
2013-10-16 06:30:23:    250 2.6.0 CHUNK received OK, 98304 octets
2013-10-16 06:30:23:    BDAT 98304
2013-10-16 06:30:23:    250 2.6.0 CHUNK received OK, 98304 octets
2013-10-16 06:30:23:    BDAT 98304
2013-10-16 06:30:23:    250 2.6.0 CHUNK received OK, 98304 octets
2013-10-16 06:30:23:    BDAT 98304
2013-10-16 06:30:23:    250 2.6.0 CHUNK received OK, 98304 octets
2013-10-16 06:30:23:    BDAT 98304
2013-10-16 06:30:23:    250 2.6.0 CHUNK received OK, 98304 octets
2013-10-16 06:30:23:    BDAT 98304
2013-10-16 06:30:23:    250 2.6.0 CHUNK received OK, 98304 octets
2013-10-16 06:30:23:    BDAT 98304
2013-10-16 06:31:18:    250 2.6.0 CHUNK received OK, 98304 octets
2013-10-16 06:31:18:    BDAT 98304
2013-10-16 06:31:18:    250 2.6.0 CHUNK received OK, 98304 octets
2013-10-16 06:31:18:    BDAT 98304
2013-10-16 06:31:18:    250 2.6.0 CHUNK received OK, 98304 octets
2013-10-16 06:31:18:    BDAT 98304
2013-10-16 06:31:18:    250 2.6.0 CHUNK received OK, 98304 octets
2013-10-16 06:31:18:    BDAT 98304
2013-10-16 06:31:18:    250 2.6.0 CHUNK received OK, 98304 octets
2013-10-16 06:31:18:    BDAT 98304
2013-10-16 06:31:18:    250 2.6.0 CHUNK received OK, 98304 octets
2013-10-16 06:31:18:    BDAT 98304
2013-10-16 06:31:18:    250 2.6.0 CHUNK received OK, 98304 octets
2013-10-16 06:31:18:    BDAT 98304
2013-10-16 06:31:18:    250 2.6.0 CHUNK received OK, 98304 octets
2013-10-16 06:31:18:    BDAT 98304
2013-10-16 06:31:18:    250 2.6.0 CHUNK received OK, 98304 octets
2013-10-16 06:31:18:    BDAT 98304
2013-10-16 06:31:18:    250 2.6.0 CHUNK received OK, 98304 octets
2013-10-16 06:31:18:    BDAT 98304
2013-10-16 06:31:18:    250 2.6.0 CHUNK received OK, 98304 octets
2013-10-16 06:31:18:    BDAT 98304
2013-10-16 06:32:08:    250 2.6.0 CHUNK received OK, 98304 octets
2013-10-16 06:32:08:    BDAT 98304
2013-10-16 06:32:08:    250 2.6.0 CHUNK received OK, 98304 octets
2013-10-16 06:32:08:    BDAT 98304
2013-10-16 06:32:08:    250 2.6.0 CHUNK received OK, 98304 octets
2013-10-16 06:32:08:    BDAT 98304
2013-10-16 06:32:08:    250 2.6.0 CHUNK received OK, 98304 octets
2013-10-16 06:32:08:    BDAT 98304
2013-10-16 06:32:08:    250 2.6.0 CHUNK received OK, 98304 octets
2013-10-16 06:32:08:    BDAT 98304
2013-10-16 06:32:08:    250 2.6.0 CHUNK received OK, 98304 octets
2013-10-16 06:32:08:    BDAT 98304
2013-10-16 06:32:08:    250 2.6.0 CHUNK received OK, 98304 octets
2013-10-16 06:32:08:    BDAT 98304
2013-10-16 06:32:08:    250 2.6.0 CHUNK received OK, 98304 octets
2013-10-16 06:32:08:    BDAT 98304
2013-10-16 06:32:08:    250 2.6.0 CHUNK received OK, 98304 octets
2013-10-16 06:32:08:    BDAT 98304
2013-10-16 06:32:08:    250 2.6.0 CHUNK received OK, 98304 octets
2013-10-16 06:32:08:    BDAT 98304
2013-10-16 06:33:04:    250 2.6.0 CHUNK received OK, 98304 octets
2013-10-16 06:33:04:    BDAT 98304
2013-10-16 06:33:04:    250 2.6.0 CHUNK received OK, 98304 octets
2013-10-16 06:33:04:    BDAT 98304
2013-10-16 06:33:04:    250 2.6.0 CHUNK received OK, 98304 octets
2013-10-16 06:33:04:    BDAT 98304
2013-10-16 06:33:04:    250 2.6.0 CHUNK received OK, 98304 octets
2013-10-16 06:33:04:    BDAT 98304
2013-10-16 06:33:04:    250 2.6.0 CHUNK received OK, 98304 octets
2013-10-16 06:33:04:    BDAT 98304
2013-10-16 06:33:04:    250 2.6.0 CHUNK received OK, 98304 octets
2013-10-16 06:33:04:    BDAT 98304
2013-10-16 06:33:04:    250 2.6.0 CHUNK received OK, 98304 octets
2013-10-16 06:33:04:    BDAT 98304
2013-10-16 06:33:04:    250 2.6.0 CHUNK received OK, 98304 octets
2013-10-16 06:33:04:    BDAT 98304
2013-10-16 06:33:04:    250 2.6.0 CHUNK received OK, 98304 octets
2013-10-16 06:33:04:    BDAT 98304
2013-10-16 06:33:04:    250 2.6.0 CHUNK received OK, 98304 octets
2013-10-16 06:33:04:    BDAT 98304
2013-10-16 06:33:04:    250 2.6.0 CHUNK received OK, 98304 octets
2013-10-16 06:33:04:    BDAT 98304
2013-10-16 06:33:59:    250 2.6.0 CHUNK receive

Applies to: Rebex Secure Mail

1 Answer

answered Oct 16, 2013 by Tomas Knopp (58.9k points)
edited Oct 16, 2013

Best answer

Hello,

with the newest version of Rebex SMTP, please try to disable the Chunking and Pipelining extensions before sending the message as in my example below:

Smtp smtp = new Smtp();
smtp.EnabledExtensions &= ~(SmtpExtensions.Pipelining | SmtpExtensions.Chunking);

smtp.Connect("server");
// send mail

If it does not help, send us the new log from the SMTP session.

Sending mails with large attachments.

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Sending mails with large attachments.

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