expected smtp 250 got -1

[toutant]

It appears - while sending large attachments i receive this error message.

23-Mar-2018 15:13:33.411: mailsend v@(#) mailsend v1.19 Winsock error[10060]: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.

23-Mar-2018 15:14:08.041: Error: Expected smtp code 250, got -1

23-Mar-2018 15:14:08.041: Could not send mail

However the email actual gets delivered successfully