Windows 10 will reach EOS (end of support) on October 14, 2025. For more information, see this article.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Not opening from Cashflow if an attachment is present

  • 1 reply
  • 2 have this problem
  • 1 view
  • Last reply by Toad-Hall

more options

Computer is Windows 10 around 3 months old. Previous to 18th Sep the customer installed Cashflow 7, not realising they also needed a local machine email program to have Cashflow send out emails.

On 18th Sep they called me to come see why Cashflow was not sending emails, and I determined the above problem. I installed Thunderbird and set up a new gmail account and tested. We then opened Cashflow and tested sending an invoice and all was good. Today 12th Oct they called back saying it wasn't working so I went to investigate.

Thunderbird showed the last invoice they sent was on 29th Sep so it worked fine for around 2 weeks. The next time they tried was yesterday 11th Oct - so something must have changed between 29th Sep- 11th Oct. When trying to send an invoice from Cashflow it opens its own window to compose the email and this is all copied to a new Thunderbird mail which opens when hitting "send" from Cashflow. From the Cashflow window you can also add more or remove attachments. When I remove the attachment, Thunderbird works and opens a new mail with all the content. When I compose a blank email from Cashflow then send it also works fine, Thunderbird opens a new mail to send with all content. As soon as I add an attachment (usually its a pdf invoice) and hit send nothing happens, Thunderbird is not triggered.

We called Cashflow support and they say they have not heard of it and they believe the problem with either anti virus or Thunderbird blocking attachments somewhere along the line, partly because Cashflow throws no errors or exceptions and also works fine with no attachments. We tried disabling anti virus (avast) and the problem remains. I also checked in attachment options but don't see anything obvious there, file size is not an issue the attachments are much less than 5MB, mainly around 60-80kb.

Any similar issues reported and resolutions I can try? I setup teamviewer on the machine so I can remote in and try anything you might suggest.

EDIT: we also tried updating from 45.3.0 to 45.4.0 today too and it did not resolve the issue

Computer is Windows 10 around 3 months old. Previous to 18th Sep the customer installed Cashflow 7, not realising they also needed a local machine email program to have Cashflow send out emails. On 18th Sep they called me to come see why Cashflow was not sending emails, and I determined the above problem. I installed Thunderbird and set up a new gmail account and tested. We then opened Cashflow and tested sending an invoice and all was good. Today 12th Oct they called back saying it wasn't working so I went to investigate. Thunderbird showed the last invoice they sent was on 29th Sep so it worked fine for around 2 weeks. The next time they tried was yesterday 11th Oct - so something must have changed between 29th Sep- 11th Oct. When trying to send an invoice from Cashflow it opens its own window to compose the email and this is all copied to a new Thunderbird mail which opens when hitting "send" from Cashflow. From the Cashflow window you can also add more or remove attachments. When I remove the attachment, Thunderbird works and opens a new mail with all the content. When I compose a blank email from Cashflow then send it also works fine, Thunderbird opens a new mail to send with all content. As soon as I add an attachment (usually its a pdf invoice) and hit send nothing happens, Thunderbird is not triggered. We called Cashflow support and they say they have not heard of it and they believe the problem with either anti virus or Thunderbird blocking attachments somewhere along the line, partly because Cashflow throws no errors or exceptions and also works fine with no attachments. We tried disabling anti virus (avast) and the problem remains. I also checked in attachment options but don't see anything obvious there, file size is not an issue the attachments are much less than 5MB, mainly around 60-80kb. Any similar issues reported and resolutions I can try? I setup teamviewer on the machine so I can remote in and try anything you might suggest. EDIT: we also tried updating from 45.3.0 to 45.4.0 today too and it did not resolve the issue

Modified by Lims

All Replies (1)

more options

We tried disabling anti virus (avast) : If you do that then the default one will take over, so leaving you in the same position.


To test you need to restart the computer in 'Safe Mode with Networking' and then see if the email with attachment goes out. If it does then you know your computer has another program interfering and the AV is the most likely place to start.

It is much better to tell the AV software not to scan any Thunderbird folders on startup or outgoing mail.