Email Sending and Deliverability Troubleshooting

Scenario

A developer deploying transactional email infrastructure first resolves SMTP sending failures (550/554 errors, SPF issues), then optimizes deliverability settings to ensure emails reach inbox instead of spam folders.

How the products combine

1. alimail · alimail-resolve-failure — Alibaba Mail — Resolve email sending failure issues

See alimail/alimail-resolve-failure.

2. resend · resend-optimize-deliverability — Resend — Improve email deliverability and inbox placement

See resend/resend-optimize-deliverability.

Typical questions

• email sending failed then going to spam
• fix SMTP error and improve deliverability
• 邮件发送失败且进垃圾箱
• cannot send email and landing in spam
• email delivery failure plus spam placement
• 550 error and domain warmup
• 邮件发送错误和送达率优化
• fix sending errors then optimize inbox placement