How Can You Open a Sealed Envelope and Reseal It?

A quick note on increasing email open rates

Email open rate (the percentage of people who open your emails) has long been a favored metric of email marketers, but things are changing. In September of 2021, Apple’s Mail Privacy Protection feature started to make it more difficult to measure the number of people who open your emails.

Previously, increasing email open rates was something many people set as a key goal in their email marketing. Now that open rates have become unreliable, there are other email marketing metrics you should focus on — ones that map more directly to your business goals.

That said, even though your ultimate goal isn’t simply getting more customers to open your emails, it’s still important that they open your emails. After all, how will they take a valuable action — like making a purchase — if they haven’t even seen your email? The only difference now is that rather than thinking about how to increase your email open rate, you’ll want to simply focus on how to make your email look interesting, valuable, and trustworthy enough to get more people to open it.

That’s what we’ll focus on in this article. So without further ado, here are five simple ways that you can get more customers to open your emails.


Funny email opening lines

Good email starting lines are typically formal, professional, or friendly. But there's an exception to every rule. When emailing to co-workers that you are so close with that reassemble more like a friend or family member than a colleague, hilarious email opening lines can be a great way to deepen the relationship further and lighten up the mood. The power of humor at the workplace can lead to bonding, but remember that something funny to you isn't always funny to the recipient. So proceed with caution to make sure to adhere to email etiquette. Find your inner comedian and lift the spirits in the workplace with these funny email opening sentence samples.

  1. I hope the week was only mildly boring.
  2. Just what you want: another email.
  3. Happy Not-Monday!
  4. I hope you're surviving another work week.
  5. I promise this email isn't as long as the previous one.
  6. Only <number> more days until Friday!
  7. I hope your morning coffee was as strong as mine.
  8. Sorry for sabotaging your inbox zero, but…
  9. I promise that this is the last email you'll receive from me. This week.
  10. Yep – you guessed right. It's me again.

How Does It Work?

Thankfully, the digital mailbox system at US Global Mail is incredibly easy to use. The design is elegant yet simple enough for anyone to use, regardless of your IT literacy level. It’s as simple as shopping on Amazon or scrolling through your Instagram feed!

When you sign up, you are given a physical mailing address in the United States of America. Once your mail items arrive at the facility, our expert handlers will scan them. These images are then uploaded to your dashboard (i.e. your virtual mailbox) for you to sort through.

This system allows you to have full control over the items you receive. Whether you want them recycled, opened, shipped to you, or shredded, the choice is yours. Your wish is the mail handler’s command!

Oh, and you don’t need to worry too much about the price either. There are multiple plans to choose so you will never be overspending for services you won’t use. Our virtual mailboxes are made to work for you.

So, what are you waiting for? With a digital box, you never have to worry about returning mail to its sender ever again!

How important is it?

Depends greatly on the contents of each message.

You should at least scan the subject headers – often people ignore the mail for months never realizing that their daily cron jobs fail.

Polite email openings

There are many shades of politeness, but when it comes to emails, you should try to come off as polite no matter what. The best way to be safe than sorry is to try to put yourself in the recipient's shoes and try to think about how they perceive your message and its first phrase. Being respectful and considerate, however, doesn't have to mean being formal. In fact, formalities can come off as stiff and make you seem uneasy to approach when not constituting an official or important occasion. Our advice is not to get hung up on finding a polite opening to your emails. Just follow good manners and write like you wish to be addressed if the situation were the other way around. The best email opening sentences for polite emails include the following examples. When in doubt, use one of these, and you can't go wrong.

  1. I hope this email finds you well.
  2. I hope your week has been great so far.
  3. Good morning/afternoon/evening.
  4. I hope your week started well.
  5. Thank you for the timely response.
  6. Thank you for getting in touch with…
  7. I'd be eager to get your advice on…
  8. I'm writing to…
  9. Allow me to introduce myself briefly.
  10. It's great to hear from you.

Return Mail To Sender: Mail Delivered to The Wrong Address

If you receive a mail item that displays a different address, your mail carrier has placed it inside your mailbox (or through your door) by mistake. Everybody makes them, so try not to be too frustrated about this. Just follow the steps below and everything will be sorted in no time.

Step One: Put It Back In Your Mailbox

As soon as you notice that the address is wrong, put the mail piece back inside your mailbox. Make sure to put the red flag up too. This tells your carrier that there is outgoing mail waiting for them to pick up when they next come to your door.

We should mention here that this changes if it is a Priority Mail Express item that has been misdelivered, you need to call 1-800-275-8777. Then, ask for the Priority Mail Express Reporting Unit. Whoever answers will let you know what to do next.

Step Two: Alternatively, Hand It To Your Mail Carrier

If you do not want to leave the item in your mailbox, make sure you are at home when the mail carrier comes the following day. Then, you can hand the misdelivered item back to them in person. Ensure that you explain it has been deposited at the wrong address. The USPS personnel can then sort it out.

You can also take the parcel, package, or envelop directly to your local post office too. It just depends on which method is the most convenient for you.

Step Three: Do Not Write On The Envelope or Parcel

In this scenario, you do not need to write anything on the packaging. This will only prevent your mail carrier from giving it to the right location so try not to impede the process!

If the item does need to be returned to the sender, your nearest Post Office will sort this out. You do not need to write a “Return to sender” message on the packaging.

Remember, you should not cover or cross out the address either. However, it might be helpful to your mail carrier if you paste a sticky note onto your mailbox stating the items you’ve left inside and the person’s name, along with the fact that they do not live at your address.


Next up is Rainloop. Rainloop is a very modern entry into the webmail arena, and its interface is definitely closer to what you might expect if you’re used to Gmail or another commercial email client. It comes with most features you’ve come to expect, including email address autocompletion, drag-and-drop and keyboard interfaces, filtering support, and many others, and it can easily be extended with additional plugins. It integrates with other online accounts like Facebook, Twitter, Google, and Dropbox for a more connected experience, and it also renders HTML emails very well compared to some other clients I’ve used, which can struggle with complex markup.

It’s easy to install, and you can try Rainloop in an online demo to decide if it’s a good fit for you.

Rainloop is primarily written in PHP, and the community edition is licensed under the AGPL. You can also check out the source code on GitHub.

Rainloop screenshot by author.

Rainloop screenshot by author.


More than just a mail client, Horde is full-fledged enterprise-ready groupware. The Horde suite is browser based, and includes web apps for reading, sending and organizing email, managing and sharing calendars, contacts, tasks, and notes. In addition, the Horde project provides a PHP framework with libraries and apps for building out a customized working environment.

Like the Nextcloud mail app, Horde doesn’t provide a server, so you’ll still need a mail host, or you can run your own. However, Horde offers a robust experience (you can demo it for yourself on their site) for managing your online life, and its UI is excellent on the desktop and mobile.

What’s one thing you could improve in your next email campaign?

When it comes to email open rates, small improvements can make a big difference.

This is especially important as more email clients include tabs that file your emails as “promotions” alongside other companies your subscriber has signed up to hear from. Your emails will be competing directly with other brand updates and promotions, so it’s crucial that you’re making your emails recognizable and communicating why people should open them..

The best way to stand out is to make sure the people who already know, like, and trust your business can recognize you right away!