Stop Fighting with Broken Xero Gmail Integrations.
When Google updates its security protocols, external accounting engines get blocked. Send 100% deliverable invoices directly inside your active Gmail window.
Why external mail relays keep failing
Web apps like Xero often send through external mail relays. Modern Gmail security, SPF alignment, and DMARC checks flag those messages — so invoices bounce, land in spam, or never leave the queue. In the United Kingdom, that means delayed cash flow and awkward follow-ups with clients who never received your bill.
Send from your active Gmail session
SMASH Invoices runs as a Chrome extension inside Gmail. It uses your logged-in Google profile locally — Google treats the send as a standard email from your address, not a third-party relay. Build the invoice in the sidebar, attach the PDF, and hit send without opening Xero in another tab.