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

Q: How do I resolve email sending failures and improve inbox deliverability? A: You can fix sending issues and prevent spam placement by first resolving SMTP errors with Alibaba Mail and then optimizing deliverability settings using Resend. This process handles initial failures like 550/554 errors and SPF issues before adjusting configurations to ensure emails reach the inbox.