关于Gmail单邮件多签名及Gmelious收件人追踪的技术问询

1. How to Add Two Different Signatures to a Single Gmail Message #

Gmail's native setup doesn't support natively inserting distinct signatures for different recipients in one outgoing message, but there are practical workarounds to pull this off:

• Manual Split & Send: For just two recipients, the simplest approach is to draft your core message, then make two separate copies of the email. For each copy, switch to the corresponding signature (you can manage multiple signatures in Gmail Settings > General > Signature) before sending to each recipient individually.
• Third-Party Gmail Add-ons: There are specialized plugins built for conditional signatures. These tools let you set rules (like matching recipient domains or specific addresses) and automatically insert the right signature when you send to targeted contacts.
• Custom Google Apps Script: If you prefer a DIY solution, you can code a small script that hooks into Gmail's API. Here's the high-level flow:
  1. Store your two signature templates as text strings in the script.
  2. Set up a trigger that intercepts outgoing messages.
  3. Detect the recipient's email address in the outgoing message.
  4. Replace or append the default signature with the matching template for that recipient.
  5. Send the customized message to the intended recipient.

2. How Gmelious Implements Per-Recipient Tracking Codes #

This per-recipient tracking functionality hinges on personalized message rendering and individual delivery—here's how it likely works in their commercial solution:

• Send Request Interception: When you hit "send" in Gmail with Gmelious active, the plugin catches the outgoing message request before it reaches Gmail's servers. It pulls out the recipient list, subject, and message content.
• Unique Tracking ID Generation: For each recipient, Gmelious creates a unique tracking identifier (like a UUID) tied to their email address in the plugin's backend database.
• Message Personalization: The plugin generates a separate copy of the original email for each recipient. It inserts the unique tracking code—usually a 1x1 invisible pixel image with the unique ID in its URL, e.g., <img src="https://gmelious.track/abc123-recipient1" width="1" height="1">—into the message, often in the signature area or at the bottom of the email.
• Individual Delivery: Instead of sending one mass email to all recipients, Gmelious uses Gmail's API to send each personalized message copy as a separate outgoing email. This guarantees each recipient gets a unique version with their own tracking code.
• Tracking & Reporting: When a recipient opens the email, the invisible pixel loads from Gmelious's server, which logs the unique ID, timestamp, and recipient details. This data is then compiled into their dashboard so you can see exactly who opened the email.

内容的提问来源于stack exchange，提问作者nrph