Email address with + char is incorrectly invalid

cannot enter contact with email address containing +, i. e. valid+email@example.com. this is a perfectly valid email address by but fails Zoho Campaigns validation.

https://en.wikipedia.org/wiki/Email_address#Local-part

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Zoho Campaigns Expert Diaries on SoundCloud, Spotify, Apple Podcasts, and YouTube
Hi email champs, As email marketers, we find great lessons in each other's works—be it the subject lines that worked good, the design that was received well, or the CTA that had the maximum clicks. Email marketing encompasses a wide variety of topics spanning everything from creation and design to development and deliverability. Here's when we from the Zoho Campaigns team found the need to build an email marketing community comprising of seasoned marketers and email geeks who can help each other
Email Deliverability Tip #3: Seal the deal with the preheader
In the last post, we learned about the subject line. Today we'll be learning about the preheader. A preheader is the short text that follows the subject line in an email. The preheader is designed to hint at what your email message is all about. A good preheader should act as a second subject line and convince your contacts to open the email. Now, let's learn the best way to craft a preheader. Your subject line and preheader should work together and accurately convey the gist of your email. Keep
Tip of the week 04 - Know about your recipients' 'prime open time.'
In today's market, the importance of customer behavior is astounding, with a vast amount of research and resources going into finding how customers make decisions. The process of persuading your customers to open your email and click on your call-to-action becomes easy when you understand the psychology behind their behavioral traits. Time to turn into a psychologist! Let's get to the basics—you want your emails to resonate well with your recipients. So, what's the primary thing involved here? It's
Tip of the week 15 - Add subscription-preferences option. Drive more engagement.
If crafting content for emails, getting creatives done, and running email campaigns is your love, then unsubscribes are the heartbreakers. You can save your emails from being unsubscribed/trashed by adding a proper subscription-preferences option in your emails (works best at the time of signup). Giving subscribers the option to choose what they want to receive from you and decide how often (frequency of the emails) your emails should hit their inboxes will increase the reach of your campaigns manifolds.
Focus Group Webinar - Integrating Zoho CRM and Zoho Campaigns
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