# Jmail 發送遇到信件無法發送問題之一解
###### tags: `Jmail`

以下為錯誤訊息:

:::danger
The message was undeliverable.
All servers failed to receive the message .
execute() {
Trying server mail:smtp-relay.sendinblue.com:587
<- 220 smtp-relay.sendinblue.com ESMTP Sendinblue SMTP 2.0
-> EHLO WIN-7FPUDKIBRSO
<- 250-smtp-relay.sendinblue.com Nice to meet you, [118.163.219.211] 250-PIPELINING 250-8BITMIME 250-AUTH LOGIN PLAIN CRAM-MD5 250 STARTTLS
-> AUTH LOGIN Sending authentication data..
-> MAIL FROM:
<- 250 Accepted
-> DATA
<- 503 Error: need RCPT command Error: 503 Error: need RCPT command .

execute() {
Trying server mail:smtp-relay.sendinblue.com:587
<- 220 smtp-relay.sendinblue.com ESMTP Sendinblue SMTP 2.0
-> EHLO WIN-7FPUDKIBRSO
<- 250-smtp-relay.sendinblue.com Nice to meet you, [118.163.219.211] 250-PIPELINING 250-8BITMIME 250-AUTH LOGIN PLAIN CRAM-MD5 250 STARTTLS
-> AUTH LOGIN Sending authentication data..
-> MAIL FROM:
<- 250 Accepted
-> DATA
<- 503 Error: need RCPT command Error: 503 Error: need RCPT command 1 of 1 servers failed }
:::

:::warning
檢查問題:
1.寄送資料是否有完整填寫
2.Jmail帳號驗證是否有填寫
:::

:::success
解決:
前端的Form input欄位有Name寫錯，導致後端沒有收到收件者的EAMIL
:::