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Why not just use Sendmail + Postfix + Courier IMAP?

You can but you should be aware that there is a permanent war between Email Service Providers (ESP) and an army of spammers. ESPs were forced to place numerous technical barriers to be able to stop spammers. Even though you are sending authorized emails you would have to take into account all that barriers to deliver to inbox and avoid junk folder.

You need to set up and authenticate an appropriate infrastructure.

Register your IP addresses and monitor their reputation.

Build and manage a complicated ensemble of software, hardware, and dedicated people team.

What types of email can I send with Wooxy?

Wooxy is an email infrastructure service designed to help applications or websites that need to send transactional emails like password resets, order confirmations, and welcome messages, autoresponders, marketing campaigns and regular notifications. View our Terms of Use for additional details.

Note: You must add SPF and DKIM records and verify ownership of your sending domains before you can send email through your account. Wooxy will not send any email from unverified domains or domains without valid SPF and DKIM records, including public domains like,, and more. Mail sent from unverified domains or domains without valid SPF and DKIM records will be rejected at the time of sending, with the rejection reason, unsigned. Learn more about SPF and DKIM and domain verification, or manage sending domains in your Wooxy account.

Can I use Wooxy to track what happens with my emails? tracks all of the typical events that occur with emails: Opens, Link Clicks, Bounces, Unsubscribes, Spam Complaints and everything you can ever need. We make that data available to you via the Dashboard or through the API.

I want to learn more about Deliverability and Email

One of the best resources is the blog Word to the Wise. Also, Return Path is a service that enhances deliverability and they publish a lot of great information through their blog and white papers. Below are some best practices from the major ESPs.

Does the amount of email I send from my IP affect my deliverability?

Yes. Generally speaking, you don’t want too few IPs, in case you experience more volume than you expect and you don’t want so many IPs that you look suspicious or spread out your volume over too many IPs. There has to be a balance of volume to IP/domain. Sending too much volume from an IP, sending from too many IPs or sending too little from a range of IPs can all lead to deliverability issues.

Rate limiting allows ESPs proper time to process and filter spam and ensure that transactional email doesn’t get backed up. Without rate limiting in place, ESPs would be even more overwhelmed than they already are. The ESPs all have different sending limits on a per hour, per day basis. Once you hit thresholds with the rate limits, send too much spam, or have any number of other issues, the ISP may start returning error messages. Some ESPs will want you to slow down the sending, stop sending for a period of time, or change your habits (due to bad engagement, bad reputation, etc). We automatically adjust your sending rates according to the feedback from these ESPs to keep you in their good graces. Generally, these rate limits are on a per IP address basis. Contact our Support Team if you wish to purchase additional dedicated IP addresses for your account.

Account Reputation

Every account has a reputation and quota. These two features help to protect us from spammers that would otherwise send a lot of emails quickly, that could then damage the reputation of our sending servers and negatively affect other users.

An account’s reputation can be Bad, Low, Normal, Good. uses many heuristics to define an account’s reputation. We look at how many bounces, spam complaints, unsubscribes, and failed content reviews the account has to set the reputation value.

What is the difference between hard and soft bounces?

You can think of hard bounces like permanent errors and soft bounces as temporary errors.

We will stop attempting delivery after one hard bounce. With soft bounces, we keep trying to deliver but eventually we will stop trying to deliver in accordance with the receiving ESP’s feedback.

Can I send to more than one recipient at a time?

No. At this moment you can send to only to one recipient at a time. We have this limitation to be able to provide you with detailed statistics on each email sent.

Can I send customized messages with Wooxy?

With you can create highly customized messages. It’s possible to put any information that you gather with your system into email (registration date, purchase date, client’s name, purchased product, or whatever you need). Through Wooxy’s API, you can send emails with needed content to any of your customers in desired time with only one simple request.

How do I close my Account?

Just send us an email by following address and our support team will help.

I need help with technical integration. Can you help?

Yes, of course. Our technical support team will be happy to help with your integration. They are at your disposal 24/7. Just send us a line by following email address with the information where you have been stuck so we could help faster:

IP Addresses and Sending Volume

If you are sending a lot of emails (greater than 50k per week), it is a good idea to have a dedicated IP in order to isolate your reputation. If you are sharing your IP, you are sharing your reputation with those other senders. In addition, ESPs rate limit your emails based on the IP. So if you are a high volume sender you should consider getting a pool of IPs. However, your reputation can also be hurt if you are not sending enough volume consistently from an IP so it’s a tricky balance.

If your email sending is volatile with large spikes of volume, ESPs may assume those large spikes are spam. Also, if you overall volume is too low, they won’t acknowledge your reputation. Generally, if you are sending less than 5,000 emails per day, a shared IP may be the right solution.

The other thing to consider is using separate IPs for your bulk and transactional mail if you are sending high volumes of email. There are a couple of reasons for this:

Delivery of time-sensitive transactional emails may get queued behind a large batch of bulk/marketing emails.

Your transactional mail will be affected by the reputation created by your bulk/marketing mail.

Even if you have a clean IP address, you need to warm up the IP gradually. This means sending emails at a low rate initially and then gradually increasing that rate, taking into account ESP feedback. If you send a ton of emails right away, they will get filtered or dropped by the ESPs. In some cases, they won’t even tell you they are dropping them. offers both shared and dedicated IPs. We are constantly monitoring the traffic on these IPs. So even for shared IPs, you can be comfortable that your reputation is not being unduly influenced by others. We also offer pools of IPs for high volume senders. In addition, we have queuing algorithms that gradually warm up your IPs. Our sending rates automatically increase over time as your IP warms up. Finally, we separate our sending queues for each domain you set up at, which mitigates the need for multiple IPs for different types of traffic.


Your email reputation is not only tied to your IP, but to your domain name as well. You should keep this in mind as you set up your email infrastructure. For the same reasons as above, It is a good idea to have separate domains or subdomains for your marketing, transactional and corporate mail. We suggest that you use your top level domain for your corporate mail and use different domains or subdomains for your marketing and transactional mail.

While it is not required to use the same domain in the From field of the message as the actual domain sending the message, it is highly recommended. Hotmail is especially finicky about this requirement and has a higher propensity to filter your messages to junk if the two domains do not match.

You should also make sure that you are using a well regarded DNS provider and that you publish all of your contact information in the WHOIS record. If you are hiding your contact information through a proxy, ESPs may take that as a signal that you are spamming.

Also, make sure you include the appropriate records at your DNS provider for authentication. While it’s not required to point MX records to the same domain as you are sending from, it is recommended. There are email providers (albeit, a minority) that will check if MX records for the domain are valid before accepting email. gives you the ability to create multiple domains or subdomains very easily. You are free to create multiple domains and subdomains for each of your transactional, marketing, and corporate email. Each domain has an isolated queue, so your transactional emails won’t get held up by your bulk mailings.


It is very important that you are using the appropriate authentication methods with your email. If you are not authenticating your email properly, ESPs will assume you are spamming and will filter or just drop your email.

The common types of authentication are: uses all of these types of authentication. When you sign up for, we provide the appropriate records for you to include at your DNS registrar. We also provide a verification button you can use to make sure that your records are set up correctly.

Unsubscribe Handling

It is important to give your recipients the ability to unsubscribe from emails. First, it is required by the CAN-Spam Act. Second, if you don’t give them this option, they are more likely to click on the spam complaint button, which will cause more harm than allowing them to unsubscribe. Finally, many ESPs look for unsubscribe links and are more likely to filter your email if they don’t have them. gives you the ability to include an unsubscribe link automatically in your email. In addition, we will automatically stop sending to email addresses that have unsubscribed. It is possible to remove addresses from the flagged list in your Control Panel or through the API.

Bounce and ESP Feedback Handling

A big part of maintaining your email reputation is processing bounces properly. While most major ESPs give bounce replies “on the wire” during the SMTP session, there are some that send bounce messages via email. In order to receive these emailed bounce messages, you must have the appropriate return path header included with your email so that recipients know where to reply with bounce information.

You must also process this bounce data and act accordingly. In addition, many ESPs will soft bounce your initial attempts at delivery. This is also called grey-listing or throttling. If you continue to send emails to bad addresses or you do not listen to ESPs feedback, you will get filtered, and eventually, your emails will just get dropped. automatically processes bounce information and reacts accordingly. A good portion of Wooxy‘s technology is devoted to the parsing of this feedback and adjusting your sending in accordance with this feedback so that you maintain a good reputation.

If we receive a hard bounce, we will stop sending to that address immediately and will not attempt future deliveries to that address. We will stop sending to an address after multiple soft bounces, according to the ESPs’ guidelines. It is possible to remove addresses from the flagged list in your control panel or through the API, in case it was a temporary issue.

Feedback Loops and Spam Complaints

Most of the major ESPs provide feedback loops through which they give you information about spam complaints. Here is a thorough list from Word to the Wise. It is important that you sign up for these feedback loops and pay attention to the feedback you are getting. If you ignore this feedback, ESPs will throttle you and eventually block you completely.

We register all of our IPs for these feedback loops. In addition, we process spam complaints automatically and will stop sending to email addresses after a recipient complains. It is possible to remove addresses from the flagged list in your Control Panel.

What is the difference between the ‘From Name’ and ‘From Email’

Each message you send out has both the from name and from email address. Simply put, the from email domain is what the receiving email server sees when initiating the session, and the from address is what your recipients will see. For better deliverability, it is recommended to use the same from domain as the from email, but it is not required.

You can technically set the from field to be whatever you like. The sender must always be one of your domains.

Does Wooxy Support Attachments?

Yes, you can include any type of file, subject to a maximum total message size of 25MB. Messages that include attachments will be queued and the attachments processed through a series of virus scanning engines to make sure that the attachments are safe for recipients.

Messages in can’t exceed 25MB in total size (including content and attachments).

There is no specific limit for individual attachments, just the total size of the message. Because attachments are Base64-encoded, this generally means that they will be 1/3 larger when sending than they are on disk due to the encoding.

Still Have Questions?
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