Hello, There is something we see in the logs, when this happens. And that is progress:
Progress 0 of 0 bytes downloaded: 0%, 65537 of 139150 bytes uploaded: 47% A normal email sending would be: 25.09.2019 17:13:35: DATA 25.09.2019 17:13:35: 354 End data with <CR><LF>.<CR><LF> 25.09.2019 17:13:35: Progress 0 of 0 bytes downloaded: 0%, 65537 of 139154 bytes uploaded: 47% 25.09.2019 17:13:35: Progress 0 of 0 bytes downloaded: 0%, 131073 of 139154 bytes uploaded: 94% 25.09.2019 17:13:35: Progress 0 of 0 bytes downloaded: 0%, 139155 of 139154 bytes uploaded: 100% 25.09.2019 17:13:35: 250 OK queued as 50edd006-c586-4eaa-9905-67507228b41d 25.09.2019 17:13:35: Connection #0 to host in-v3.mailjet.com left intact Now I saw we set CURLOPT_BUFFERSIZE to 16384 in some older code. Not sure why. I can comment that out and set CURLOPT_UPLOAD_BUFFERSIZE to 32768 and now it works reliable as far as I see: 25.09.2019 17:56:35: DATA 25.09.2019 17:56:35: 354 End data with <CR><LF>.<CR><LF> 25.09.2019 17:56:35: Progress 0 of 0 bytes downloaded: 0%, 32769 of 154151 bytes uploaded: 21% 25.09.2019 17:56:35: Progress 0 of 0 bytes downloaded: 0%, 65537 of 154151 bytes uploaded: 43% 25.09.2019 17:56:36: Progress 0 of 0 bytes downloaded: 0%, 98305 of 154151 bytes uploaded: 64% 25.09.2019 17:56:36: Progress 0 of 0 bytes downloaded: 0%, 131073 of 154151 bytes uploaded: 85% 25.09.2019 17:56:36: Progress 0 of 0 bytes downloaded: 0%, 154152 of 154151 bytes uploaded: 100% 25.09.2019 17:56:36: 250 OK queued as e6d6a58a-f93a-47f8-9e41-bcd77ed93e32 25.09.2019 17:56:36: Connection #0 to host in-v3.mailjet.com left intact So could it be there is trouble when CURL sends 65537 bytes and the buffer size is just 16384? Sincerely Christian -- Read our blog about news on our plugins: http://www.mbsplugins.de/ ------------------------------------------------------------------- Unsubscribe: https://cool.haxx.se/list/listinfo/curl-library Etiquette: https://curl.haxx.se/mail/etiquette.html
