{"id":10012,"date":"2026-06-08T09:00:49","date_gmt":"2026-06-08T07:00:49","guid":{"rendered":"https:\/\/mybox.com\/help\/?post_type=manual_kb&#038;p=10012"},"modified":"2026-06-08T09:00:51","modified_gmt":"2026-06-08T07:00:51","slug":"ce-este-smtp","status":"publish","type":"manual_kb","link":"https:\/\/mybox.com\/help\/ro\/knowledgebase\/what-is-smtp\/","title":{"rendered":"Ce este SMTP?"},"content":{"rendered":"<div class=\"translation-block translation-block-merged\">\n<p class=\"wp-block-paragraph\">SMTP (Simple Mail Transfer Protocol) is the standard protocol used for sending email messages across the internet.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">When you send an email using an email application such as Outlook, Thunderbird, Apple Mail, or webmail, SMTP is the protocol responsible for delivering the message from your device to the outgoing mail server and, ultimately, to the recipient&#8217;s mail server.<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_86 ez-toc-wrap-left counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/mybox.com\/help\/ro\/knowledgebase\/what-is-smtp\/#How_Does_SMTP_Work\" >How Does SMTP Work?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/mybox.com\/help\/ro\/knowledgebase\/what-is-smtp\/#What_Is_SMTP_Used_For\" >What Is SMTP Used For?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/mybox.com\/help\/ro\/knowledgebase\/what-is-smtp\/#SMTP_and_Authentication\" >SMTP and Authentication<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/mybox.com\/help\/ro\/knowledgebase\/what-is-smtp\/#Typical_SMTP_Settings\" >Typical SMTP Settings<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/mybox.com\/help\/ro\/knowledgebase\/what-is-smtp\/#Outgoing_Mail_Server_SMTP\" >Outgoing Mail Server (SMTP)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/mybox.com\/help\/ro\/knowledgebase\/what-is-smtp\/#Encrypted_Connection_Recommended\" >Encrypted Connection (Recommended)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/mybox.com\/help\/ro\/knowledgebase\/what-is-smtp\/#Alternative_SSL_Connection\" >Alternative SSL Connection<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/mybox.com\/help\/ro\/knowledgebase\/what-is-smtp\/#Authentication\" >Authentication<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/mybox.com\/help\/ro\/knowledgebase\/what-is-smtp\/#SMTP_vs_IMAP_vs_POP3\" >SMTP vs IMAP vs POP3<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/mybox.com\/help\/ro\/knowledgebase\/what-is-smtp\/#Common_SMTP_Errors\" >Common SMTP Errors<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/mybox.com\/help\/ro\/knowledgebase\/what-is-smtp\/#Summary\" >Summary<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_Does_SMTP_Work\"><\/span>How Does SMTP Work?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<\/div>\n\n<div id=\"mybox-4155219064\" class=\"mybox-content mybox-entity-placement\"><div class=\"early-access-banner-inpost\">\r\n  <div class=\"banner-left-inpost\">\r\n    <div class=\"icon-box-inpost\">\r\n      <img decoding=\"async\" src=\"https:\/\/mybox.com\/help\/wp-content\/uploads\/2026\/02\/square-info-icon.svg\" alt=\"Info\">\r\n    <\/div>\r\n    <div class=\"text-box-inpost\">\r\n      <span class=\"label-inpost\"><span class=\"translation-block translation-block-banner-text\">Acces timpuriu<\/span><\/span>\r\n      <h4><span class=\"translation-block translation-block-banner-text\">Mai ave\u021bi nevoie de ajutor?<\/span><\/h4>\r\n      <p><span class=\"translation-block translation-block-banner-text\">Contacta\u021bi echipa noastr\u0103 de servicii pentru clien\u021bi.<\/span><\/p>\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <div class=\"banner-right-inpost\">\r\n    <a href=\"https:\/\/panel.mybox.com\/helpdesk2\/v\/list\/\" class=\"banner-button-inpost\"><span class=\"translation-block translation-block-banner-text\">Trimite mesaj<\/span><\/a>\r\n  <\/div>\r\n<\/div><\/div>\n\n<div class=\"translation-block translation-block-merged\"><p class=\"wp-block-paragraph\">SMTP handles the process of sending email messages.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A typical email delivery process looks like this:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>You compose a message in your email application.<\/li>\n\n\n\n<li>The application connects to an SMTP server.<\/li>\n\n\n\n<li>The SMTP server verifies the connection and accepts the message.<\/li>\n\n\n\n<li>The server forwards the message to the recipient&#8217;s mail server.<\/li>\n\n\n\n<li>The recipient retrieves the message using IMAP or POP3.<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">SMTP is therefore responsible for sending mail, while IMAP and POP3 are responsible for receiving it.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_Is_SMTP_Used_For\"><\/span>What Is SMTP Used For?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">SMTP is used whenever you:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Send a new email.<\/li>\n\n\n\n<li>Reply to a message.<\/li>\n\n\n\n<li>Forward an email.<\/li>\n\n\n\n<li>Send notifications from a website.<\/li>\n\n\n\n<li>Send messages from applications or scripts.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Without SMTP, email delivery would not be possible.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"SMTP_and_Authentication\"><\/span>SMTP and Authentication<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The original SMTP protocol was developed in the early 1980s, when internet security requirements were very different from today.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Originally, SMTP did not verify the identity of senders, making it possible for malicious users to abuse mail servers for:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Spam distribution<\/li>\n\n\n\n<li>Sender spoofing<\/li>\n\n\n\n<li>Phishing attacks<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">To address these issues, modern mail servers use additional security mechanisms such as:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>SMTP Authentication (SMTP AUTH)<\/li>\n\n\n\n<li>SSL\/TLS encryption<\/li>\n\n\n\n<li>SPF (Sender Policy Framework)<\/li>\n\n\n\n<li>DKIM (DomainKeys Identified Mail)<\/li>\n\n\n\n<li>DMARC (Domain-based Message Authentication, Reporting and Conformance)<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">These technologies help verify the legitimacy of email senders and improve email security.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Typical_SMTP_Settings\"><\/span>Typical SMTP Settings<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">When configuring an email application, use the following Mybox SMTP settings:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Outgoing_Mail_Server_SMTP\"><\/span>Outgoing Mail Server (SMTP)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>Server: smtp.mybox.com\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Encrypted_Connection_Recommended\"><\/span>Encrypted Connection (Recommended)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>Port: 587\nEncryption: STARTTLS\/TLS\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Alternative_SSL_Connection\"><\/span>Alternative SSL Connection<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>Port: 465\nEncryption: SSL\/TLS\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Authentication\"><\/span>Authentication<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>Username: Full email address\nPassword: Email account password\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"SMTP_vs_IMAP_vs_POP3\"><\/span>SMTP vs IMAP vs POP3<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Protocol<\/th><th>Purpose<\/th><\/tr><\/thead><tbody><tr><td>SMTP<\/td><td>Sending email<\/td><\/tr><tr><td>IMAP<\/td><td>Receiving and synchronizing email<\/td><\/tr><tr><td>POP3<\/td><td>Downloading email to a local device<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Most modern email clients use SMTP together with IMAP:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>SMTP \u2192 Send messages\nIMAP \u2192 Receive and synchronize messages\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Common_SMTP_Errors\"><\/span>Common SMTP Errors<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">SMTP errors often occur due to:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Incorrect username or password<\/li>\n\n\n\n<li>Incorrect SMTP server address<\/li>\n\n\n\n<li>Incorrect port number<\/li>\n\n\n\n<li>Firewall restrictions<\/li>\n\n\n\n<li>Invalid sender address<\/li>\n\n\n\n<li>Authentication failures<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Examples include:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>535 Authentication failed\n<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>550 Relay access denied\n<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>554 Message rejected\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Summary\"><\/span>Summary<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">SMTP (Simple Mail Transfer Protocol) is the standard protocol responsible for sending email messages. Whenever you send an email from an application, website, or webmail interface, SMTP handles the delivery process.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Modern SMTP servers use authentication and encryption technologies to ensure secure and reliable email transmission, making SMTP an essential component of today&#8217;s email infrastructure.<\/p>\n<\/div>","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"template":"","format":"standard","manualknowledgebasecat":[30],"manual_kb_tag":[1295,1304,1399,1801,1806,2173,4366,4367,4368,4369],"class_list":["post-10012","manual_kb","type-manual_kb","status-publish","format-standard","hentry","manualknowledgebasecat-configuration-of-email-clients","manual_kb_tag-smtp-authentication","manual_kb_tag-simple-mail-transfer-protocol","manual_kb_tag-smtp-settings","manual_kb_tag-email-delivery","manual_kb_tag-smtp-protocol","manual_kb_tag-outgoing-mail-server","manual_kb_tag-email-sending","manual_kb_tag-smtp-encryption","manual_kb_tag-starttls","manual_kb_tag-smtps"],"_links":{"self":[{"href":"https:\/\/mybox.com\/help\/ro\/wp-json\/wp\/v2\/manual_kb\/10012","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mybox.com\/help\/ro\/wp-json\/wp\/v2\/manual_kb"}],"about":[{"href":"https:\/\/mybox.com\/help\/ro\/wp-json\/wp\/v2\/types\/manual_kb"}],"author":[{"embeddable":true,"href":"https:\/\/mybox.com\/help\/ro\/wp-json\/wp\/v2\/users\/1"}],"version-history":[{"count":1,"href":"https:\/\/mybox.com\/help\/ro\/wp-json\/wp\/v2\/manual_kb\/10012\/revisions"}],"predecessor-version":[{"id":10018,"href":"https:\/\/mybox.com\/help\/ro\/wp-json\/wp\/v2\/manual_kb\/10012\/revisions\/10018"}],"wp:attachment":[{"href":"https:\/\/mybox.com\/help\/ro\/wp-json\/wp\/v2\/media?parent=10012"}],"wp:term":[{"taxonomy":"manualknowledgebasecat","embeddable":true,"href":"https:\/\/mybox.com\/help\/ro\/wp-json\/wp\/v2\/manualknowledgebasecat?post=10012"},{"taxonomy":"manual_kb_tag","embeddable":true,"href":"https:\/\/mybox.com\/help\/ro\/wp-json\/wp\/v2\/manual_kb_tag?post=10012"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}