Documentation

Relay Lane Configuration

Setup Guide
Integration

Relay lanes are a free, temporary migration tool. Configure your existing ESP credentials here so Laneful can maintain delivery continuity while your dedicated IP lanes warm up.

Before You Configure Relay Lanes

1. Relay lanes are temporary: They exist solely to bridge delivery during IP lane warmup. Once your IP lanes are fully warmed, relay lanes are removed.

2. Domain Authentication Required: You must authenticate your domain before configuring any lanes.

3. Have your ESP credentials ready: You will need your SMTP credentials or API key from your current email provider (SendGrid, Mailgun, AWS SES, Postmark, or similar).

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Setup
Configuration

Overview

Relay lanes are a free, temporary migration bridge. During IP lane warmup (typically 2-6 weeks), Laneful routes traffic through your existing ESP to maintain delivery continuity. Once your dedicated IP lanes are fully warmed, the relay lane is removed and all traffic flows directly through your IPs.

Before You Begin

  • • Have your current ESP's SMTP credentials or API key ready
  • • Verify your domain with your ESP if you have not already
  • • Your relay lane will be active only during IP warmup — Laneful engineers will coordinate removal when migration is complete

Testing Your Configuration

You can test your SMTP connection during the relay lane creation process in Laneful. This allows you to verify your configuration before saving the relay lane.

SendGrid Configuration

SendGrid provides reliable email delivery with excellent analytics and deliverability features.

  1. 1

    Create SendGrid Account

    Sign up at SendGrid.com and verify your account.

  2. 2

    Generate API Key

    Go to Settings > API Keys and create a new API key with "Mail Send" permissions.

  3. 3

    Verify Domain

    Go to Settings > Sender Authentication and verify your domain to improve deliverability and avoid spam filters.

  4. 4

    Configure SMTP Settings

    Use these settings in your Laneful relay lane:

    SMTP Server: smtp.sendgrid.net
    Port: 465
    Use TLS: enabled
    Username: apikey
    Password: [Your SendGrid API Key]

Mailgun Configuration

Mailgun is a powerful email service with excellent developer tools and analytics.

  1. 1

    Create Mailgun Account

    Sign up at Mailgun.com and verify your account.

  2. 2

    Verify Domain

    Go to Sending > Domains > Add new domain and verify your domain to improve deliverability.

  3. 3

    Get SMTP Credentials

    Click the Send product, then click Sending to expand its suboptions. Click Domain settings, then the SMTP credentials tab. Add a new SMTP user to get your username and password.

  4. 4

    Configure SMTP Settings

    Use these settings in your Laneful relay lane:

    SMTP Server: smtp.mailgun.org
    Port: 465
    Use TLS: enabled
    Username: [Your Mailgun SMTP Username]
    Password: [Your Mailgun SMTP Password]

AWS SES Configuration

Amazon SES is a cost-effective email service that integrates well with other AWS services.

  1. 1

    AWS Account Setup

    Ensure you have an AWS account and access to the AWS SES console.

  2. 2

    Create SMTP Credentials

    In the SES console, choose SMTP settings in the left navigation pane, then choose Create SMTP Credentials. Type a name for your SMTP user and choose Create user.

  3. 3

    Verify Domain

    Navigate to Configuration > Identities > Create identity and verify your domain to improve deliverability.

  4. 4

    Configure SMTP Settings

    Use these settings in your Laneful relay lane:

    SMTP Server: [Your AWS SES SMTP endpoint] (e.g., email-smtp.us-east-2.amazonaws.com)
    Port: 465
    Use TLS: enabled
    Username: [Your SES SMTP Username]
    Password: [Your SES SMTP Password]

Important: Production Access Required

New AWS SES accounts are placed in a sandbox environment with restrictions. You must request production access to send emails to non-verified email addresses and domains. Learn how to request production access.

Postmarkapp Configuration

Postmarkapp specializes in transactional emails with excellent deliverability and speed.

  1. 1

    Create Postmarkapp Account

    Sign up at Postmarkapp.com and verify your account.

  2. 2

    Get Server API Token

    Select a server in your dashboard, then click the API Tokens tab. The Server API Token is used for both username and password in SMTP configuration.

  3. 3

    Configure SMTP Settings

    Use these settings in your Laneful relay lane:

    SMTP Server: smtp.postmarkapp.com
    Port: 587
    Use TLS: disabled
    Username: [Your Postmarkapp Server API Token]
    Password: [Your Postmarkapp Server API Token]

Troubleshooting

Common issues and solutions when configuring email relay lanes.

Authentication Errors

  • • Verify your API keys or SMTP credentials are correct
  • • Check that your account is active and not suspended
  • • Ensure you have the necessary permissions for sending emails

Delivery Issues

  • • Verify your domain is properly configured with your email service provider
  • • Check your sender reputation and ensure you're not on any blacklists
  • • Review your email content for spam triggers
  • • Monitor your sending limits and quotas

Rate Limiting

  • • Check your email service provider's sending limits
  • • Implement proper rate limiting in your application
  • • Consider upgrading your plan if you need higher sending volumes
  • • Monitor your sending patterns to avoid being flagged as spam

Getting Help

If you're still experiencing issues after trying these solutions:

  • • Check your email service provider's documentation and support
  • • Review Laneful's Sending Email documentation
  • • Contact Laneful support with specific error messages and configuration details