Toggle navigation Home Store Browse All ----- Webhosting Domains Quotation (Webdesign Services) eMail Hosting SEO- Search Engine Optimisation GRAPHIC DESIGN Dedicated/ VPS Webhosting BULKSMS Mobi Applications Website Maintenance Register a New Domain Transfer Domains to Us Announcements Knowledgebase Network Status Affiliates Contact Us Account Login Register ----- Forgot Password? Categories 9 CGI Scripts 34 Databases 28 Dedicated Servers 1 DNS 15 Domains 5 eCommerce 79 eMails 27 FTP 1 General Issues 1 MX Records 1 Nameservers 28 Other 104 Scripting 254 Web Hosting Control Panel 9 Web Resources 8 Web Stats & Logs 11 Web Tools 8 Website Help and Diagnostics 4 Windows Hosting Categories CGI Scripts (9) Databases (34) Dedicated Servers (28) DNS (1) Domains (15) eCommerce (5) eMails (79) FTP (27) General Issues (1) MX Records (1) Nameservers (1) Other (28) Scripting (104) Web Hosting Control Panel (254) Web Resources (9) Web Stats & Logs (8) Web Tools (11) Website Help and Diagnostics (8) Windows Hosting (4) [EML4.14] What is SMTP? SMTP stands for Simple Mail Transfer Protocol, a protocol for sending email messages between servers. Most email systems that send mail over the Internet use SMTP to send messages from one server to another; the messages can then be retrieved with an email client using an email download protocol (usually either POP3). In addition, SMTP is generally used to send messages from a mail client to a mail server. This is why you need to specify both the incoming mail (POP3) server and the SMTP server when you configure your email application. SMTP operates on port 25 and 587 (as some ISPs block port 25). Was this answer helpful? Yes No Print this Article Also Read [EML4.03] Is there a limit on attachement sizes when sending via Webmail? Yes, attachments sent via Webmail are limited to 2Mb - if you wish to send larger attachments,... [EML4.31] How do I setup an email box (pop3)? All your email settings can be controlled through your Control Panel. Simply log into your... [EML4.20] How Do I set up a mailbox in Thunderbird? NOTE that emails in Thunderbird will usually be able to send out after about 24hrs when the DNS... [EML2.19] Why does my email bounce with 550 relay not permitted? This usually happens because the nameservers on the affected domain have been changed to make the... [EML2.08] I'm getting a 451 Message temporarily deferred message when sending to Yahoo or BT - What does this mean? Yahoo have extremely strict criteria for accepting email and often defer e-mail if they think... Support My Support Tickets Announcements Knowledgebase Downloads Network Status Open Ticket × Close Title Loading...