Setting Up SMTP Email Delivery for Vendor Central Invoices

Quick Answer: To send Vendor Central invoices via email automatically, you need a working SMTP server (such as Gmail or Outlook), your SMTP credentials (host, port, username, and password), and a tool like InvoiceOps that integrates those credentials into the invoice dispatch workflow. Once configured, invoices are emailed to designated recipients immediately after generation and validation.

Amazon Vendor Central does not natively support automatic email dispatch of processed invoices to third parties — your accountant, your logistics partner, or your GST filing vendor. That gap creates manual work: downloading PDFs, opening your email client, attaching files, and hitting send — for every single purchase order.

SMTP-based email delivery closes that gap entirely.

What Is SMTP and Why Does It Matter for Vendor Central?

SMTP (Simple Mail Transfer Protocol) is the underlying standard that powers email sending. When you configure SMTP in an invoice automation tool, you are telling the software: "After you process an invoice, deliver a copy to these addresses using this mail server."

For Indian Vendor Central sellers, this matters for three practical reasons:

1. GST audit trails — Your CA or GST consultant needs invoice copies promptly. Automated delivery ensures they receive them within minutes of generation rather than days.
2. Logistics coordination — Some 3PL providers require invoice copies before releasing shipments. SMTP delivery can trigger that handoff instantly.
3. Internal records — Your accounts team can receive invoice copies directly into a monitored inbox without anyone manually forwarding files.

Prerequisites Before You Configure SMTP

Before touching any settings, gather the following:

• SMTP host — e.g., smtp.gmail.com for Gmail, smtp-mail.outlook.com for Outlook, or your company mail server hostname
• Port number — 587 (TLS/STARTTLS, recommended) or 465 (SSL). Avoid port 25 for outbound mail.
• Authentication credentials — Your email address and either your account password or an app-specific password
• Recipient addresses — The email addresses that should receive invoice copies

Gmail-Specific Note for Indian Sellers

If you use a Google Workspace account (common among small and mid-size vendors), you cannot use your regular Google password with SMTP. You must generate an App Password under your Google Account security settings. Standard Gmail (@gmail.com) accounts also require App Passwords if 2FA is enabled, which it should be.

Step-by-Step SMTP Configuration

Step 1: Open SMTP Settings in Your Invoice Tool

In InvoiceOps, navigate to Settings → Email Delivery → SMTP Configuration. You will see fields for host, port, encryption type, username, and password.

Step 2: Enter Your Server Details

Fill in the fields:

Field	Example Value
SMTP Host	smtp.gmail.com
Port	587
Encryption	STARTTLS
Username	yourname@yourcompany.com
Password	(app password, not login password)

Step 3: Set Recipient Addresses

Add one or more recipient addresses in the To field. You can add CC addresses for your accounts team. Some setups include a BCC to a compliance archive mailbox.

Step 4: Customize the Email Template

A good invoice email should include the PO number, invoice number, vendor code, and the invoice date in the subject line. For example:

Invoice #INV-20240512-001 | PO: 4500012345 | Vendor: ACME Foods

This makes it easy for recipients to search and file invoices without opening every attachment.

Step 5: Send a Test Email

Before enabling automatic dispatch, use the Send Test button. Verify:

• The email arrives in the recipient inbox (not spam)
• The PDF attachment opens correctly
• The subject line and body text are accurate

Common SMTP Errors and Quick Fixes

Authentication failed — Double-check your app password. If using Gmail, App Passwords are generated under Google Account → Security → 2-Step Verification → App passwords.

Connection timeout on port 587 — Your network or ISP may be blocking port 587. Try port 465 with SSL encryption.

TLS handshake failure — Ensure your SMTP host address is spelled correctly. A single character typo will cause this error.

Emails going to spam — Add an SPF record to your domain's DNS that authorizes your SMTP relay. If you are using a shared hosting mail server, this is a common issue.

Best Practices for Production Use

• Use a dedicated sending address like invoices@yourcompany.com rather than a personal address. It looks professional and is easier to monitor.
• Set up a delivery confirmation log so failed deliveries are caught before they cause compliance gaps.
• Rotate app passwords periodically — quarterly is a reasonable cadence for most businesses.
• Test after any password change — SMTP configurations silently fail after credential updates unless you catch them quickly.

What Happens After SMTP Is Configured?

Once your SMTP settings are active, every invoice that completes the Vendor Central processing workflow — draft creation, enrichment, validation, and submission — automatically triggers an email to your configured recipients. No manual downloads, no copy-pasting, no forgotten attachments.

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Automate your entire Vendor Central invoice workflow — including SMTP email delivery — with InvoiceOps. Set it up once and let every invoice deliver itself.