我试图msmtp从这个问题PHP+Ubuntu Send email using gmail form localhost设置服务器。因此，我已将default（帐户）设置为发送自：
/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 autak987@gmail.com
password PASSWORD #not real password
from autak987@gmail.com
logfile /var/log/msmtp.log
现在，当我尝试发送测试电子邮件（以 root 身份执行）时：
echo -e "Subject: Test Mail\r\n\r\nThis is my first test email." | msmtp --debug --from=default -t autak987@gmail.com
给出：
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 = autak987@gmail.com
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=autak987@gmail.com from=default recipients=autak987@gmail.com 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
所以日志说<-- 535-5.7.8 Username and Password not accepted. Learn more at，但我收到了一封警告电子邮件，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。所以msmtp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，我该如何从 php 表单发送电子邮件？