PHPMailer SMTP Error Could not connect to SMTP host

Question

I ve used PHPMailer on several projects but now I m stuck  It gives me the error    SMTP Error  Could not connect to SMTP host  I ve tried sending email from Thunderbird and it works   But not through PHPMailer     Here are the settings from Thunderbird   Server name  mail exampleserver com Port  587 Username  user exampleserver com Secure Authentication  No Connection Security  STARTTLS    I ve compared these with the server at my last project where I used PHPMailer and they were   Server name  mail exampleserver2 com Port  465 Username  user exampleserver2 com Secure Authentication  No Connection Security  SSL TLS    My php code is     mail   new PHPMailer      mail- gt IsSMTP       send via SMTP   mail- gt Host   SMTP HOST     SMTP servers   mail- gt Port   SMTP PORT     SMTP servers   mail- gt SMTPAuth   true     turn on SMTP authentication   mail- gt Username   SMTP USER     SMTP username   mail- gt Password   SMTP PASSWORD     SMTP password   mail- gt From   MAIL SYSTEM    mail- gt FromName   MAIL SYSTEM NAME    mail- gt AddAddress  aSecuredGetRequest  email       mail- gt IsHTML true      send as HTML   Where I am wrong

User · Answer

does mail exampleserver com exist       if not try the following code  you must have gmail account    mail- gt SMTPSecure    ssl      mail- gt Host  smtp gmail com      mail- gt Port  465       mail- gt Username      you gmail com      SMTP account username  mail- gt Password      your gmail password      mail- gt SMTPKeepAlive   true     mail- gt Mailer    smtp     mail- gt IsSMTP       telling the class to use SMTP    mail- gt SMTPAuth     true                      enable SMTP authentication    mail- gt CharSet    utf-8      mail- gt SMTPDebug    0

User · Answer

I recently dealt with this problem  and the cause of the problem turned out to be that the root certificate on the SMTP server that I was connecting to was the Sectigo root certificate that recently expired   If you re connecting to the SMTP server by SSL TLS or STARTTLS  and you ve not changed anything recently in the environment where your PHPMailer script is running  and this problem suddenly occurred - then you might want to check for an expired or invalid certificate somewhere in the certificate chain on the server     You can view the server s certificate chain using openssl s client     For SSL TLS on port 465   openssl s client -connect server domain tld 465   openssl x509 -text   For STARTTLS on port 587   openssl s client -starttls smtp -crlf -connect server domain tld 587   openssl x509 -text

User · Answer

Your problem is most likely this  Connection Security  STARTTLS Connection Security  SSL TLS  Those are 2 different protocols  are you using the correct one  whatever one you re using in Thunderbird needs to be used   Try setting the variable      if you re using SSL  mail- gt SMTPSecure    ssl      OR use TLS  mail- gt SMTPSecure    tls

User · Answer

In my case it was a lack of SSL support in PHP which gave this error   So I enabled extension php openssl dll   mail- gt SMTPDebug   1  also  hinted towards this solution   Update 2017   mail- gt SMTPDebug   2   see  https   github com PHPMailer PHPMailer wiki Troubleshooting enabling-debug-output

User · Answer

In my case in CPANEL i have  Register mail ids  option where i add my email address and after 30 minutes it works fine with simple php mail function

User · Answer

I had a similar issue  I had installed PHPMailer version 1 72 which is not prepared to manage SSL connections  Upgrading to last version solved the problem

User · Answer

Since this is a popular error  check out the PHPMailer Wiki on troubleshooting   Also this worked for me    mailer- gt Port    587

User · Answer

Followed code worked for me    mail   new PHPMailer true     mail- gt isSMTP      Set mailer to use SMTP  mail- gt CharSet    utf-8     set charset to utf8  mail- gt SMTPAuth   true    Enable SMTP authentication  mail- gt SMTPSecure    tls     Enable TLS encryption   ssl  also accepted   mail- gt Host    smtp gmail com     Specify main and backup SMTP servers  mail- gt Port   587    TCP port to connect to  mail- gt SMTPOptions   array       ssl    gt  array           verify peer    gt  false           verify peer name    gt  false           allow self signed    gt  true           mail- gt isHTML true     Set email format to HTML   mail- gt Username    Sender Email     SMTP username  mail- gt Password    Sender Email Password     SMTP password   mail- gt setFrom  example mail com    John Smith     Your application NAME and EMAIL  mail- gt Subject    Test    Message subject  mail- gt MsgHTML  HTML code      Message body  mail- gt addAddress  User Email    User Name      Target email    mail- gt send

User · Answer

I had a similar issue and figured out that it was the openssl cafile configuration directive in php ini that needed to be set to allow verification of secure peers  You just set it to the location of a certificate authority file like the one you can get at http   curl haxx se docs caextract html   This directive is new as of PHP 5 6 so this caught me off guard when upgrading from PHP 5 5

User · Answer

mail- gt SMTPDebug   2     to see exactly what s the issue   In my case this helped    mail- gt SMTPSecure   false   mail- gt SMTPAutoTLS   false

User · Answer

I had the same problem and it was because PHPMailer realized the server supported STARTTLS so it tried to automatically upgrade the connection to an encrypted connection  My mail server is on the same subnet as the web server within my network which is all behind our domain firewalls so I m not too worried about using encryption  plus the generated emails don t contain sensitive data anyway     So what I went ahead and did was change the SMTPAutoTLS to false in the class phpmailer php file          Whether to enable TLS encryption automatically if a server supports it     even if  SMTPSecure  is not set to  tls      Be aware that in PHP  gt   5 6 this requires that the server s certificates are valid      var boolean     public  SMTPAutoTLS   false

User · Answer

Since this questions shows up high in google  I d like to share here my solution for the case where PHP was just upgraded to version 5 6  which has stricter SSL behavior    The PHPMailer wiki has a section on this   https   github com PHPMailer PHPMailer wiki Troubleshooting php-56-certificate-verification-failure  The suggested workaround is including the following piece of code    mail- gt SMTPOptions   array       ssl    gt  array           verify peer    gt  false           verify peer name    gt  false           allow self signed    gt  true            This should work for PHPMailer 5 2 10  and up    Note  Obviously  and also as suggested in that wiki  this should be a temporary solution       The correct fix for this is to replace the invalid  misconfigured or self-signed certificate with a good one

[php] PHPMailer: SMTP Error: Could not connect to SMTP host

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