Gmail禁止通过SMTP发送电子邮件吗？

如何解决Gmail禁止通过SMTP发送电子邮件吗？

我已尝试根据问题PHP+Ubuntu Send email using gmail form localhost设置msmtp服务器。因此，我将default（帐户）设置为发送方：

/ etc / msmtprc ：

defaults
tls on
tls_starttls on
tls_trust_file /etc/ssl/certs/ca-certificates.crt
account default
host smtp.gmail.com
port 587
auth on
user [e-mail]
password PASSWORD #not real password
from [e-mail]
logfile /var/log/msmtp.log

现在，当我尝试发送测试电子邮件（以root用户身份执行）时：

echo -e "Subject: Test Mail\r\n\r\nThis is my first test email." | msmtp --debug --from=default -t [e-mail]

给予：

loaded system configuration file /etc/msmtprc
ignoring user configuration file /root/.msmtprc: No such file or directory
falling back to default account
using account default from /etc/msmtprc
host = smtp.gmail.com
port = 587
source ip = (not set)
proxy host = (not set)
proxy port = 0
timeout = off
protocol = smtp
domain = localhost
auth = choose
user = [e-mail]
password = *
passwordeval = (not set)
ntlmdomain = (not set)
tls = on
tls_starttls = on
tls_trust_file = /etc/ssl/certs/ca-certificates.crt
tls_crl_file = (not set)
tls_fingerprint = (not set)
tls_key_file = (not set)
tls_cert_file = (not set)
tls_certcheck = on
tls_min_dh_prime_bits = (not set)
tls_priorities = (not set)
auto_from = off
maildomain = (not set)
from = default
add_missing_from_header = on
add_missing_date_header = on
remove_bcc_headers = on
dsn_notify = (not set)
dsn_return = (not set)
logfile = /var/log/msmtp.log
logfile_time_format = (not set)
syslog = (not set)
aliases = (not set)
reading recipients from the command line and the mail
<-- 220 smtp.gmail.com ESMTP o60sm9122564eda.30 - gsmtp
--> EHLO localhost
<-- 250-smtp.gmail.com at your service,[2a00:1028:8d1b:f32a:baac:e4e8:de4:df3c]
<-- 250-SIZE 35882577
<-- 250-8BITMIME
<-- 250-STARTTLS
<-- 250-ENHANCEDSTATUSCODES
<-- 250-PIPELINING
<-- 250-CHUNKING
<-- 250 SMTPUTF8
--> STARTTLS
<-- 220 2.0.0 Ready to start TLS
TLS session parameters:
    (TLS1.3)-(ECDHE-X25519)-(ECDSA-SECP256R1-SHA256)-(AES-256-GCM)
TLS certificate information:
    Owner:
        Common Name: smtp.gmail.com
        Organization: Google LLC
        Locality: Mountain View
        State or Province: California
        Country: US
    Issuer:
        Common Name: GTS CA 1O1
        Organization: Google Trust Services
        Country: US
    Validity:
        Activation time: Tue 11 Aug 2020 10:57:38 AM CEST
        Expiration time: Tue 03 Nov 2020 09:57:38 AM CET
    Fingerprints:
        SHA256: 8A:D6:DC:62:1D:6B:BB:B9:45:03:38:E8:40:AC:8C:A8:60:75:CF:B6:95:93:83:4C:ED:AD:BA:CA:71:47:44:E7
        SHA1 (deprecated): 84:5D:7F:E9:0E:7C:6A:C0:70:F6:04:09:4A:1C:AA:5D:6C:BF:11:E2
--> EHLO localhost
<-- 250-smtp.gmail.com at your service,[2a00:1028:8d1b:f32a:baac:e4e8:de4:df3c]
<-- 250-SIZE 35882577
<-- 250-8BITMIME
<-- 250-AUTH LOGIN PLAIN XOAUTH2 PLAIN-CLIENTTOKEN OAUTHBEARER XOAUTH
<-- 250-ENHANCEDSTATUSCODES
<-- 250-PIPELINING
<-- 250-CHUNKING
<-- 250 SMTPUTF8
--> AUTH PLAIN AGF1dGFrOTg3QGdtYWlsLmNvbQBNaWxhbmJhcm9zMTIz
<-- 535-5.7.8 Username and Password not accepted. Learn more at
<-- 535 5.7.8  https://support.google.com/mail/?p=BadCredentials o60sm9122564eda.30 - gsmtp
msmtp: authentication failed (method PLAIN)
msmtp: server message: 535-5.7.8 Username and Password not accepted. Learn more at
msmtp: server message: 535 5.7.8  https://support.google.com/mail/?p=BadCredentials o60sm9122564eda.30 - gsmtp
msmtp: could not send mail (account default from /etc/msmtprc)
msmtp: cannot log to /var/log/msmtp.log: cannot open: Permission denied
msmtp: log info was: host=smtp.gmail.com tls=on auth=on user=[e-mail] from=default recipients=[e-mail] smtpstatus=535 smtpmsg='535-5.7.8 Username and Password not accepted. Learn more at\n535 5.7.8  https://support.google.com/mail/?p=BadCredentials o60sm9122564eda.30 - gsmtp' errormsg='authentication failed (method PLAIN)' exitcode=EX_NOPERM

因此日志显示<-- 535-5.7.8 Username and Password not accepted. Learn more at，但我收到一封警告电子邮件someone has tried to log in your account，我确认是我。然后它说The application you have tried to use,Google blocked,because it does not fulfil our security standards。那么msmtp是否不符合安全标准？我已经下载了所有需要的证书（并且凭据是正确的登录名或密码）。因此，如果msmtp不符合安全标准，该如何从php表单发送电子邮件？

解决方法

您可能需要在Google帐户中启用安全性较低的应用程序，才能使用smtp https://support.google.com/accounts/answer/6010255?hl=en

如果您使用2要素身份验证，则需要生成应用专用密码 https://support.google.com/accounts/answer/185833?hl=en