SendGrid

SendGrid (Twilio SendGrid) is a mature, enterprise-grade email platform with strong compliance story (SOC 2, GDPR, HIPAA BAA available on higher tiers).

Pricing

• Free — 100 emails/day, forever.
• Essentials — from $19.95/month for 50k emails.
• Pro — from $89.95/month with dedicated IP, sub-user management.

Verify current pricing at https://sendgrid.com/pricing — tiers and limits change.

Setup

1. Create an account at https://sendgrid.com.
2. Complete sender authentication — either a single sender verification or full domain auth (SPF/DKIM/DMARC).
3. Create an API key with at least Mail Send permission.

import (
    "github.com/gopackx/go-notification/channel/mail"
    "github.com/gopackx/go-notification/channel/mail/sendgrid"
)

notifier.RegisterChannel(sendgrid.New(sendgrid.Config{
    APIKey: os.Getenv("SENDGRID_API_KEY"),
    From:   mail.Address{Name: "My App", Address: "noreply@example.com"},
}))

Configuration reference

Sending

func (n OrderShipped) ToMail(u notification.Notifiable) *mail.Message {
    return mail.NewMessage().
        SetSubject("Your order shipped").
        Line("Tracking inside.").
        Action("Track", "https://example.com/track")
}

Troubleshooting

• 401 Unauthorized — bad API key, or the key is missing Mail Send scope.
• 403 Forbidden: The from address does not match a verified Sender — complete sender authentication in the SendGrid dashboard.
• Emails in spam even on authenticated domain — check SendGrid's Stats → Engagement panel; high bounce or spam-complaint rates will downrank your IP reputation.