Vb net validating email address

01-Mar-2015 21:37 by 8 Comments

Vb net validating email address - robin dating kumar

Based on the target ISP, it also verifies each address against a set of intelligent rules, which exclude most typos with major email service providers.Then it extracts the domain from each address and performs different DNS lookups to ensure that the related domain exists and is configured to accept email messages.

Next, it tries to contact the mail exchanger responsible for the given email address and begins a fake SMTP dialog with that server, emulating a real mail server.

This way it ensures that the server can handle emails for the address.

Many SMTP servers actually give back false positive answers as a protection against spammers: to overcome this issue, Email Verify for . NET's unique multithreaded engine lets you perform thousands of validations at once. NET follows Microsoft's event-based pattern and allows for optimal integration with any desktop-based solution.

NET finally attempts to query the target mail exchanger multiple times with different fabricated addresses. NET is completely customizable: every setting can be easily changed and tweaked to match your business requirements, and the entire email validation pipeline can be extended and mixed with your own custom logic. It features a smart algorithm that, once given a group of e-mail addresses to verify, chooses the order to process each item of the batch to maximize its overall performance, thus achieving the highest allowed degree of parallelism. NET framework version 2.0 or newer (including v4.5). The component exposes different asynchronous methods and notification events built from the ground up to support complex multi-threaded scenarios like the ones usually found in this kind of applications.

It is completely written in managed code (C#) and is compliant with Common Language Specification (CLS), so it can be used with any other . NET), C++/CLI, J#, Iron Python, Iron Ruby, F# and Power Shell. Success) { // TODO: Show a message box with the great news } With a very stable and mature code base, Email Verify for . This way, whether your project is a desktop-based application, Web-based, or a class library, you may use these notifications to react accordingly at every phase of the verification activity, as well as to present a message to the end user or to insert a row into a database. NET internally employs a very fast, multi-threaded e-mail address validation engine capable of processing hundreds of items at once using asynchronous-based processing logic and different optimization algorithms.

Designed from the ground up to make the developer's life easier, Email Verify for . NET supports eight different e-mail address verification levels and allows you to configure every possible aspect of the validation process, including adherence to IETF standards preferences, network-related settings, timeouts for multi-threaded activities and even your own custom validation rules, embedded into the main email verification pipeline. Parse("")); // Pass the configured settings to the verification engine var result = engine. Furthermore, the component exposes dedicated methods and structures to track down and configure each verification activity that may take place in every asynchronous scenario at optimal performance.

NET's whole architecture let you perform a full email validation with just a single method call, whether the job is as simple as a syntax check or as complex as a mailbox existence test. In the following snippet, for example, Email Verify for . In the following snippet, for example, Email Verify for .Here is, for example, what it takes to validate an email address using the default settings for the component: var engine = new Verification Engine(); var result = engine. NET is configured not to allow domain literals in e-mail addresses, while allowing comments and quoted strings. NET is fed with a structure internally optimized for reducing delays and network transmissions, while obeying a configurable amount of time between each verification to the same SMTP server.Furthermore, the component is set to use a particular DNS server (instead of a system-configured server) for its lookups: var settings = new Verification Settings { Allow Domain Literals = false, Allow Comments = true, Allow Quoted Strings = true }; // The component will use just the provided DNS server for its lookups settings. thus respecting Netiquette and avoiding being tagged as a spammer by the external mail exchangers: var group = new Verification Group(); // Add some entries to the verification group group += new Verification("[email protected]"); group += new Verification("[email protected]"); // One entry also has non-default settings group += new Verification("[email protected]", new Verification Settings { Allow International Domain Names = false }); // Start the validation of the whole group, asynchronously await engine. Smtp); // At this point, every address has been validated... On top of that, the component exposes various events that notify the user about any change in the e-mail address validation's progress, including verifications starts/ends and depths advancements.Finally, like as in the single validation scenario described above, the component exposes different events that notify the user about changes in the life cycle of each group of validations and their related tasks. NET employs DNS and SMTP protocol functionalities to perform e-mail address validations and absolutely avoids sending any email message to external mail exchangers for delivery. NET verifies email addresses with up to six different kinds of tools.These events may be used to track down the overall progress of a given set of multiple addresses, for example, and possibly feed a user interface element of your project, like such as a progress bar or a list of messages. It validates any address you give it against IETF standards (RFC 1123, RFC 2821, RFC 2822, RFC 3490, RFC 3696, RFC 4291, RFC 5321, RFC 5322 and RFC 5336, among others), thus guaranteeing its syntactical validity.