Sending e-mail with attachments generates error: "Sorry, Mailspring was unable to deliver this message. Connection error - unable to connect to the server / port you provided"

system · February 17, 2021, 10:47pm

Description

Currently using IMAP configuration without SSL. Sending and receiving e-mail is working fine except when I’m trying to send an e-mail with any attachment (no matter the format or size). I receive the following error:

Sorry, Mailspring was unable to deliver this message. Connection error - unable to connect to the server / port you provided

Setup

OS and Version: Windows 10 Home
Mailspring Version: 1.6.3-134a0e55

Additional Context

Using own domains. Works fine on alternative software.

(Originally posted by coldpumpkin on GitHub.)

github.com/Foundry376/Mailspring

Sending e-mail with attachments generates error: "Sorry, Mailspring was unable to deliver this message. Connection error - unable to connect to the server / port you provided"

opened 09:30AM - 06 Aug 19 UTC

closed 10:53PM - 17 Feb 21 UTC

coldpumpkin

bug mailserver-incompatibility migrated

Currently using IMAP configuration without SSL. Sending and receiving e-mail is …working fine except when I'm trying to send an e-mail with any attachment (no matter the format or size). I receive the following error: _"Sorry, Mailspring was unable to deliver this message. Connection error - unable to connect to the server / port you provided"_ ##### Are there any related issues? https://github.com/Foundry376/Mailspring/issues/757 https://github.com/Foundry376/Mailspring/issues/947 ##### What operating system are you using? Windows 10 Home ##### What version of Mailspring are you using? 1.6.3-134a0e55 ##### Is this an email sync or connection issue? Connection (it seems so) ##### Is the issue related to a specific email provider (Gmail, Exchange, etc.)? No. Using own domain's. Works fine on alternative software. ##### Is the issue reproducible with a particular attachment, message, signature, etc? Any kind of attachment, as stated above.